Unfortunately, I seem to have lost the nice little Texas Hold-Em Tournament Clock software I was given last year, and can't find it on any of my systems. This is irritating, because it means I'll have to keep track of the blind progression manually.
I figured we'd start with the blinds small for the first three 20-minute rounds, then increase the ramping so we can aim to be finished within three hours. That produces this blind progression:
Minutes/Small/Big Blinds
0 10/20
20 20/40
40 40/80
60 60/120
80 100/200
100 200/400
120 500/1000
140 1000/2000
160 2000/4000
180 3000/6000
200 4000/8000
220 5000/10000
With this progression, you pretty much force people all-in after a while, but that's intentional. We don't want to be there all night.
Last year, the heads-up round was somewhat extended by the rather unlikely event of thirteen consecutive all-in survivals.