Home heads-up tourney...your thoughts on structure

[ChuckyB]

Starts with 5,000 chips. Blinds are scheduled to be 25-50; 50-100; 100-200; 200-400; 300-600; 600-1200. Each level to be 10 minutes long. Corresponding rounds will have double the chips, and each level will doubles as well.

I'm trying to make four rounds finish in four hours. Do you think this a good/fair structure? Should the levels be more than 10 minutes?