20-player deepstack tournament
T25,000 starting stacks:
12 x T25
17 x T100
12 x T500
7 x T1000
2 x T5000
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50 chips = T25K
Blind structure (250BB starting stacks)
15-minute blind levels, all blind increases between 25%-50%.
rd sb bb
L1 50 100
L2 75 150
L3 100 200
L4 150 300
remove T25 chips
L5 200 400
L6 300 600
L7 400 800
L8 600 1200
L9 800 1600
remove T100 chips
L10 1000 2000
L11 1500 3000
L12 2000 4000
L13 2500 5000
remove T500 chips
L14 3000 6000
L15 4000 8000
L16 6000 12000
L17 8000 16000
remove T1000 chips
L18 10000 20000
L19 15000 30000 ***
L20 20000 40000
L21 30000 60000
L22 40000 80000
L23 50000 100000
With 20-players, the tournament should end around L18 or L19. With 15-minute blind levels, that is right at 5 hours total time (4.5 hours play plus color-up breaks). Structure will run about 6.5 hours total with 20-minute blinds. 16- or 17-minute blind levels would hit your 5.5 hours total time target.
Use 20x T5000 chips to color-up the T25, T100, and two/thirds of the T500 chips in play. You will need 3 x T25K plaques to replace the remainder of the T500's, and another 6 x T25K plaques to replace the T1000 chips in play (if you choose to do so). There are only 200 chips in play once heads-up, so removing the T1000s is not absolutely necessary.