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A month late, but hopefully my experiences can help in future tourneys.
My structure:
I use 20 min levels throughout with a 10 minute break (8 min + two 1-min warnings) after every 4th level.
Players like the time consistency and I adjust blind levels to accommodate this.
Blinds go up between a minimum of 33% and maximum of 50% (with a few exceptions, mainly at the levels where the BB can be a single 500 or 1000 chip)
Also note that I start out at 50/100 to prevent the immediate doubling that would normally occur with starting at 25/50.
I also start them out with 200 bb so that it doesn’t turn into a shove fest too early.
Most can get 2-3 hours of play in at that stack amount before busting (no rebuys), then the blind pressure starts to mount and players begin to drop out faster in the later levels.
I also use BB antes to mimic what they will experience in the casino, and this also helps shorten the tourney.
The general rule that I find works in calculating tourney length is that the tourney will approximately end when the SB+BB+BB ante = 10% of chips in play. For your tourney just leave out the BB ante in that calculation.
In my structure above, with a 20K starting stack (x 18 players = 360K chips in play; so 10% = 36K) my tourney ends about Level 14-15 (SB+BB+BB ante = 30K-40K)… That’s about 5.5 hours… sometimes 1 level earlier due to being short stacked or if they chop it.
If you gave your players a deeper starting stack (15K) to avoid the early short stacked “bingo” play you mention, and followed my (or a similar) structure and blind level % increase, yours would end when the SB+BB = 27K, or about Level 15-16 (5.5-6 hours), and probably even a level earlier.
One final note: I keep chip denominations in play that are 1 denomination below the BB chip denomination. So as long as 100s are used for the blinds, I keep 25s in play. Once we go to 1000s for blinds, then I keep 100s as my smallest denom and color up the 25s. This is repeated at 4K/8K (keep 500s, color up 100s).
Good luck. Let us know what you institute and how it turns out.