[tomb1]

Something slightly less than the bible . . .

A good rule of thumb is that the tourney should end about when the blinds (and antes) equal about 10% of the total chips in play.

So 12 people x $300K stacks and no rebuys = $3.6MM in play. And 10% of that is $360K, so your target blind level for 5 hours should be about $120,000 / $240,000. Something like the 100/200 or 125/250 shown in the previous posts.

YMMV of course depending on playing style, breaks, beverages consumed, etc.....

Good luck!