Day 1 will have 10 hours (2pm-Midnight)
Say 8 hours is actual play (16 levels), leaving 2 hours for breaks
Blinds at the end of the play would be 5k/10k
Assuming 200 runners, that"s 3,000,000 chips in play.
You"d want average stack to be around 40 BB"s , so 400k, which would mean 7/8 players left at the end of Day 1.
Even if you make it the nittiest of APAT nitfests and say average will be 20 BB"s, that"s still only bringing back 15 players for Day 2 from a field of 200.
The structure feels as if it"s somewhere between a 1 day and a 2 day event.