Here are two options (one T5-based, one T25-based), both designed for roughly 7 hours for up to 80 players with re-buys, using either 125 or 150 BB stacks with relaxed 30% average blind increases and 15-minute levels.
For a tournament that size, I'd recommend paying everybody at the 10-player final table (top 17% with 60 players, top 12.5% with 80 players) Payouts could look like this (% of total prize pool):
1 - 35.00%
2 - 20.00%
3 - 11.25%
4 - 8.75%
5 - 6.25%
6 - 6.25%
7 - 3.75%
8 - 3.75%
9 - 2.50%
10 - 2.50%
For 80 total entries (including re-buys), 2.5% (9th or 10th) would be twice the buy-in amount.
====================================================
A. 80-player T2500 tournament with re-buys (~20)
starting stacks:
10 x T5
10 x T25
7 x T100
1 x T500
1 x T1000
-----------
29 chips = T2500 (plus a bounty chip makes 30 chips)
re-buy stacks:
4 x T25
4 x T100
2 x T1000
-----------
10 chips = T2500
chip set required:
800 x T5
880 x T25 (includes 80 for re-buys)
700 x T100 (includes 80 for re-buys, 40 for T5 color-up, and 20 spares)
160 x T500 (includes 44 for T25 color-up and 36 spares - can handle 7 more re-buys at 5 x T500)
220 x T1000 (includes 40 for re-buys, 68 for T100 color-up, and 32 spares)
40 x T5000 (includes 13 for T500 color-up, and 27 spares)
-----------
2800 total chips
blind structure:
10/20 opening blinds (125BB), 15-minute blind levels, 30% average increases
re-buys for first four levels (1 hour mark, ~40BB re-buy stacks)
// optional: re-buys for first seven levels (first break @ 1:45 mark, ~20BB) //
lvl sb bb
L1 10 20
L2 15 30
L3 20 40
L4 30 60
end re-buy period
L5 40 80
L6 50 100
L7 60 120
remove T5 chips
L8 75 150
L9 100 200
L10 125 250
L11 150 300
L12 200 400
L13 250 500
remove T25 chips
L14 300 600
L15 400 800
L16 500 1000
L17 600 1200
L18 800 1600
remove T100 chips
L19 1000 2000
L20 1500 3000
L21 2000 4000
L22 2500 5000
remove T500 chips
L23 3000 6000
L24 4000 8000 **
L25 5000 10000 **
L26 6000 12000 **
L27 8000 16000
L28 12000 24000
L29 20000 40000
** estimated maximum tournament length (roughly 6+ hours plus breaks), approximately 200 chips in play at tournament end
====================================================
B. 80-player T7500 tournament with re-buys (~20)
starting stacks:
8 x T25
8 x T100
5 x T500
4 x T1000
-----------
25 chips = T7500
re-buy stacks:
5 x T500
5 x T1000
-----------
10 chips = T7500
chip set required:
640 x T25
640 x T100
530 x T500 (includes 100 for re-buys, and 30 spares)
530 x T1000 (includes 100 for re-buys, 80 for T25/T100 color-ups, and 30 spares)
160 x T5000 (includes 130 for T500/T1000 color-up, and 30 spares)
-----------
2500 total chips (spare T500/T1000 chips can handle 6 additional re-buys)
blind structure:
25/50 opening blinds (150BB), 15-minute blind levels, 30% average increases
re-buys for first five levels (first break) @ 1:15 hour mark, ~30BB re-buy stacks
lvl sb bb
L1 25 50
L2 25 75
L3 50 100
L4 75 150
L5 100 200
break (end re-buy period)
L6 125 250
L7 150 300
L8 200 400
L9 250 500
remove T25 chips
L10 300 600
L11 400 800
L12 500 1000
L13 600 1200
L14 800 1600
remove T100 chips
L15 1000 2000
L16 1500 3000
L17 2000 4000
L18 2500 5000
remove T500 chips
L19 3000 6000
L20 4000 8000
L21 5000 10000
L22 6000 12000
L23 8000 16000
remove T1000 chips
L24 10000 20000
L25 15000 30000 **
L26 20000 40000 **
L27 30000 60000
L28 40000 80000
L29 50000 100000
L30 75000 150000
** estimated maximum tournament length (roughly 6+ hours plus breaks)
====================================================