I have been a technician for 30 years, just so you know y qualifications, so you know whether or not to trust my answers. <lol!>
Hello there, i just have a few questions for anyone that knows about laptops.
I have a Toshiba Windows 7, 2010-11.
Okay.
1. How many years do laptops last without going bad nowadays.
These days, typically about as long as a desktop PC, although it depends on the quality of both machines, of course.
But there are "desktop quality & performance" laptops out there now. They are more expensive, of course.
2. What kind of things do i look for if it goes bad, does it freeze or slow down.
Yes.
If it's freezing, it may be overheating (although rebooting is likely). A big problem that laptops have, is that because they tend to run so hot, since everything is packed right in there and air flow isn't always what it could be, the compound used between the CPU and the heat sink to transfer heat up off of the CPU chip dries out over time, which means it starts to run hotter and hotter as more time goes by. You can solve this with a trip to your local Radio Shack to pick up a tube ($2-$3), take apart the laptop and put some more (not too much) between the heat sink and the CPU. Then watch the temp drop from what it was while running it.
Remember that laptops are just really small PC's, with the components all packed in together, everything on top of/right next to something else. They are not some "completely different" computing device and so, they are prone to the same problems as any PC. The only difference is that with laptops, you're bound to see more issues crop up related to heat. And that does not mean only that it might be running too hot, but that devices inside it may be dying, due to this heat.
There's a simple rule with computers. Any computers, including any electronic devices you can think of. And that rule is that;
HEAT KILLS!!!
And in laptops, you have to be especially careful!!!
Therefore, for example, your RAM may die, due to heat. Your CPU could "melt", due to heat. Your hard drive may die, due to heat.
There is a reason that you're constantly seeing systems advertised with great cooling (especially with today's high performance components).
3. Is it possible to save your windows media songs to email, then copy to new laptop.
Not a good idea to try it that way (if you mean actual MP3 files), because typically, ISP's only allow for up to a certain size attachment. And while one or two songs may make it, how many emails do you want to create with attachments? You'll be there for like 8 years doing it! <lol>
I would suggest a USB stick back up. Or burn them to a blank CD, or DVD if you have a really large amount of them. You don't have to create a music disc. You just burn them as you would any other data and they'll play fine and then you can just copy them onto your new setup.
Or if you want to, you could create a DropBox account and transfer them up there and then you can access them from any computer, anywhere. Myself, I too advantage of it when they were offering free 50GB (yes, I said 50GB) accounts to spread the word and compete with the others earlier this year. But even if you have to pay for an account big enough, it's worth it. And there's other cloud drive services out there. Just check the capacity they offer for free and for pay accounts.
4. Does it hurt it to keep it idle during the day, or should i shut it down after every use.
With a laptop, you can just set it up in the Power Settings, to go to "sleep" after say, 30 min. I personally would not allow it to write to disc and hibernate, as they don't always wake up properly.

But if you set it to go to sleep, it will power down 99% of what's running and you can just tap the space bar or something to wake it up. Just make sure that if you do lots of downloads, that you look for a setting in that specific software to prevent it from going to sleep in the middle of your downloads and also make sure to exit that specific software once your downloads are complete, so that it will rest again.
These days, you don't have to worry as much, especially if you know that you are not having overheating issues, which shouldn't be a problem for a few years anyway, if at all with your machine.
I leave min on all the time and make the screen turn off after 15 min let it go to sleep after 30 min, setting the HD, etc. for the same amount of time, just in case.
Now what I said above relates to a laptop with the lid open (I leave mine open). But with laptops, they're usually set to go to sleep immediately once you close the lid (check your Power settings in the Control Panel).
Personally, I only actually power mine down completely about once a month. I do this, just so it will. As weird as it sounds,especially with desktop PC's, sometimes, if you never power the system off and leave it running for like a year or something and then go to power it off and then on again, it won't power up again. I'm not saying that will be the case every time, but I have replaced a number of Power Supplies over the years because of this. The machine ran fine for however long and then one day, they shut it down to move it or something and it would not come up again. It actually does happen.
5. How long is too long for laptops to be on.
If you mean with the laptop constantly running and performing tasks, then it would depend on the laptop. But I have had them running for days at a time on many occasions, without any problems at all! I am not recommending this. I would never recommend this, even for desktop PC's, because I do not know that the user has their setup cooling properly. But I would not worry about letting it run overnight or something assuming that you are cooling it properly.
*** And remember that not blocking the fans & exhausts and keeping the area immediately around any computer, especially a laptop clear, is crucial!!! ***
Again, as long as you are not having overheating issues, which you would know are probably the culprit anyway, if your setup is regularly rebooting, or freezing up on you.
Typically, overheating reboots it and bad RAM (possibly caused by heat) freezes it. But each can have the other effect.
And if you find that your system reboots, or sometimes, yes, freezes and then you go to turn it off for a minute (at least 30 secs to let the charge in RAM dissipate) and then on again and then it either reboots again during bootup, or it shows a black screen, or the BSOD, etc., then you probably do have a heat issue.
But if it appears to run normally and you don't have those problems, then don't worry about it. You will not kill it by running it, as long as it is properly cooling (see warning further up).
I would, if your Power Settings allow, use an aggressive cooling setup. And in battery mode, you don't have to be as aggressive, but you would also limit your CPU's performance to save battery, which would make it run cooler anyway.
And make sure in both CMOS and in your Windows Power Settings in your Control Panel, to set it to "Wake On LAN". This way, if you wish to access your laptop remotely from another computer, or like I do, from my Tablet (see my signature below), then you can wake it up by sending a signal to your RJ45 connection (you must use RJ45 for that purpose, but if you leave it just sitting on a desk, then why not use RJ45, as it is more reliable anyway). You should also check the Network Adapter Settings for the RJ45 adapter (network adapter) in Device Mangler, to make sure that Wake On LAN is enabled there too.
6. Is it possible for a laptop to crash and never re-start.
It is possible for YOU to crash and never restart!
So the answer is "YES!", just like any other computer.
You're welcome. It was my pressure. Er... I mean, my pleasure. Yea, that's it! My pleasure! Yea, that's the ticket, yea! <lol!>
The reason i'm asking, is because well..the last question basically.
Is there a possibility laptops crash and don't start again?
Like I said, yes. Get yourself a decent laptop. HP's aren't too bad these days and their support is top notch! I mean as far as covering the system, should something go wrong with it. Lenovo makes a decent one too, although personally, I would go through IBM to buy a laptop instead (IBM sold their laptop division to Lenovo, but you can still buy laptops direct from IBM and they are superior when it comes to reliability and warranty coverage from IBM!).
Dell is a nice laptop, although pricey. And Toshiba doesn't make a bad one. Just make sure to get some bang for your buck!
Hope this helped and if you have any other questions, please feel free to ask. It's no problem at all.