Very cool idea, I applaud you for trying to get this up and running.
Definitely a hard NO to BB Ante's, it will speed up tourney too much and a multi day event you don't want sped up bc, well that kind of defeats the purpose.
I think the first thing you need to figure out is are you going to have a dinner break or not. Personally I'd do no dinner breaks to keep costs down and more money in the pot and just serve water, soda, coffee, pretzels, uncrustables, cookies, munchkins, other snacks that won't ruin the cards/chips.
- If no dinner break then I like the 12 levels and 15 minute breaks and be done with Day 1 which is 6 hours of play and 30 mins of breaks. Or play down to the final 9 players if it gets to that before 12 levels is up.
- If yes then you need to get pizza/hot dogs and add a 45 minute dinner break after level 8 and maybe play another 2-4 levels day 1 but add a level or two in between so that day 1 ends with blinds of 2000/4000 like
@TheRealStephen12 suggested. With 40 players @30k each that is 1,200,000 chips in play so if you play down to 9 players the avg stacks will be 133k with day 2 starting at 2k/5k which is 26 BB avg.
I'd probably do 40 minute levels for Day 2 because I don't see this lasting past level 20k/40k or 25k/50k. With 2.4mil chips in play (80players) that leaves only 60 BB's on the table when Blinds are 20/40k and 48 BB's when blinds are 25k/50k so short stacks will need to shove and even if its heads up it should last long. (With BB Ante's in the mix this thing is probably over by level 12k/24k or 15/30k which is only levels 8 & 9 of Day 2)
Good Luck! Send Pics when this gets going!