I think you also need to consider chip values and qty's into your equation. With your proposed structure there is only one level which a T25/T50 chip would be required and the T100 chips are needed through level 7. You will need a lot of T100 chips. For a pub game your dealers are going to be spending a lot of time making change and counting chips.
This structure starts slow to allow a lot of play at the beginning and only requires 4 chip values 100/500/1000/5000
Freezeout Tournament
Starting Stack: 25000
Players: 15
Duration: 4 hours
Blind Structure
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Level Time(min) Small Blind Big Blind Running Time
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1 20 100 200 0:20
2 20 200 400 0:40
3 20 300 600 1:00
4 20 400 800 1:20
5 20 500 1000 1:40
6 20 1000 2000 2:00
7 20 2000 4000 2:20
8 20 3000 6000 2:40
9 20 4000 8000 3:00
10 20 6000 12000 3:20
11 20 10000 20000 3:40
12 20 15000 30000 4:00
13 20 25000 50000 4:20
14 20 40000 80000 4:40
15 20 60000 120000 5:00
Created by the Blind Valet structure creator at
http://blindvalet.com/