[napawino]

I have a tournament like this at my place all the time. 6-8 people - lasting about 2 hours. We use the following structure:
1500 starting chips
No rebuys

Blinds
15 min 10/20
15 min 15/30
15 min 25/50
15 min 50/100
15 min 75/150
15 min 100/200
15 min 200/400
15 min 300/600
15 min 400/800
15 min 600/1200
15 min 1000/2000
15 min 1500/3000

Also, & VERY important, we use a blue & a red deck & have the next dealer shuffling & ready to go while the cards are being cleared from the last hand. As a penalty, whoever goes out has to deal for the group. (This also speeds it up just a little.)

We don't do rebuys because when we tried rebuys it made the tournament MUCH longer as a result of the extra chips in play. Instead, we get a side game of low BB NL going once 3 people go out. Usually everyone sticks around & we end up playing another tournament. We usually get in two tournaments in 4 to 4 1/2 hours.

Good luck.