Expecting about 20-30 players. Want at least 6 hours of play but no more than 9.

275 Starting chips

White (1)-10
Red (5)-8
Blue (10)-5
Green (25)-3
Black (100)-1

Payout: 44%, 28%, 16%, 12%

Blinds (each level 20 min)
1. 1/2
2. 2/4
3. 3/6
4. 4/8
5. 5/10
6. 6/12
7. 8/16
8. 10/20
9. 12/24
***Race off Whites***
10. 15/30
11. 20/40
12. 25/50
***Race off Reds***
13. 30/60
14. 40/80
15. 50/100
16. 60/120
17. 80/160
18. 100/200
19. 120/240
20. 150/300
21. 200/400
22. 250/500
23. 300/600
24. 400/800
25. 500/1000
26. 600/1200
27. 800/1600

Here is how I would amend this:

Expecting about 20-30 players. Want at least 6 hours of play but no more than 9.

300 Starting chips

White (1)-10
Red (5)-13
Green (25)-5
Black (100)-1

Payout: 44%, 28%, 16%, 12%

Blinds
1. 1/2
2. 2/4
3. 3/6
4. 4/8
5. 5/10
6. 7/14
***Race off Whites***
7. 10/20
8. 15/30
9. 20/40
10. 25/50
11. 30/60
12. 40/80
***Race off Reds***
13. 50/100
14. 100/200
15. 150/300
***Race off Greens add blues as 500***
16. 200/400
17. 300/600
18. 400/800

You will have a max of 30*300 or 9000 chips in play. With an average heads up stack of 4500, this should end at the 200/400 level or 16 levels. 16*20mins is 5hr20min which seems to short for you. A 30 min level would add another 160mins which is now at about 8hr. You still have a cushion to get into the 300/600 level.

If you have less than 30 players, you could probably do 35min blinds and you would have a nice slow, deep tourney.

I don't like this area, much too extreme.

You could add a 75-150 level. I am definitely a proponent of never having the blinds double from one round to the next, except for the first two levels where it's usually necessary.

Okay, you could add 35/70 and 75/150. Keep in mind that if you can manage 35 minute levels, this is going to be nice and slow.

Actaully, I simply missed the 75/150 which is a level I like to add into the WSOP structure. That's why I give out lots of green chips.

I think it looks pretty good. I personally like gradual structures like this.

You could easily eliminate a few levels and move to 25 or 30 minute levels but this really just becomes a matter of personal preference.

Have a good tournament!

-JD

Multiply everything X 10. It just feels better not having single unit chips.

I'd say there is a very high probability that his chips have denominations on them.