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:
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.