You can shorten boil times with extract/steeping grains.
60 minute boils serve 2 purposes; 1) maximize hop utilization, and 2) Boil off DMS (extract doesn't have this problem).
Often when I get a new hop I do a 3 gallon extract batch, and boil for only 30 minutes. I make hop additions at 25, 20, 25, 10, 5 and 0. This is called hop bursting, and all the bittering comes from the finishing hops. It does require more hops, but results in lots of flavor and aroma.