I copied this a while ago. Perhaps it's the right structure for a 4 hour game and that could work.
Tournament
T1000 stacks (250BB)
rd sb bb
L1 2 4
L2 3 6
L3 4 8
L4 6 12
L5 8 16
remove T1 chips
L6 10 20
L7 15 30
L8 20 40
L9 30 60
L10 40 80
remove T5 chips
L11 50 100
L12 75 150
L13 100 200
L14 150 300
remove T25 chips
L15 200 400
L16 300 600 ***
L17 400 800
L18
600 1200
With 15 minute levels, a single-table tournament should last no later than L16 (four hours plus breaks).
starting stacks:
10 x T1
8 x T5
10 x T25
7 x T100
----------------
35 chips = T1000
chip set:
100 x T1
80 x T5
100 x T25
75 x T100 (includes 5x to color-up T1 and T5 chips)
5 x T500 (used to color-up T25 chips)
----------------
360 chips