Here are three different ways to do it. All stack/set/format variants will run 3:15 to 3:30 total time with included color-up breaks.
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T1-based stacks (T300):
10 x T1
8 x T5
10 x T25
--------
28 chips = T300
300 chip set:
100 x T1
80 x T5
120 x T25 (includes 20x for T1/T5 color-ups)
--------
300 chips
15-minute levels, 150 BB:
lvl sb bb
L1 1 2
L2 1 4
L3 3 6
L4 4 8
L5 6 12
L6 8 16
remove T1 chips
L7 10 20
L8 15 30
L9 20 40
L10 30 60
L11 40 80
L12 60 120
remove T5 chips
L13 75 150 ***
L14 100 200
L15 150 300
======================
T5-based stacks (T1000):
10 x T5
10 x T25
7 x T100
--------
27 chips = T1000
300 chip set:
100 x T1
100 x T5
100 x T25 (includes 30x for T5/T25 color-ups)
--------
300 chips
15-minute levels, 100 BB:
lvl sb bb
L1 5 10
L2 5 15
L3 10 20
L4 15 30
L5 20 40
L6 30 60
L7 40 80
remove T5 chips
L8 50 100
L9 75 150
L10 100 200
L11 150 300
remove T25 chips
L12 200 400
L13 300 600 ***
L14 400 800
L15 600 1200
======================
T25-based stacks (T7000):
8 x T25
8 x T100
12 x T500
--------
28 chips = T7000
300 chip set:
80 x T25
80 x T100
140 x T500 (includes 20x for T25/T100 color-ups)
--------
300 chips
15-minute levels, 140 BB:
lvl sb bb
L1 25 50
L2 25 75
L3 50 100
L4 75 150
L5 100 200
L6 150 300
remove T25 chips
L7 200 400
L8 300 600
L9 400 800
L10 600 1200
L11 800 1600
L12 1200 2400
remove T100 chips
L13 1500 3000
L14 2000 4000 ***
L15 2500 5000
L16 3000 6000
======================