I was engaged for just under a year. I proposed in late summer, and my fiancee wanted a summer wedding. We did not need that long, but we selected a place and found which weekends were available, then saw when the priest was available, then the DJ, and so on until there was one date left. The toughest part was ensuring the things we wanted were available on the same date.
I know someone who became engaged late last year, but is not getting married until next summer (he lives in Manhatten, she is outside Philly, so there are the logistics of moving, and the woes that come with planning a wedding in a larger city).
Congrats!