What is a good hourly rate for $0.25/$0.50 - 6 handed?

[SuttonChris]

Hi, I am presently reading The Theory of Poker and I came across the concept of working out your hourly rate at the beginning of the book. What would most of you consider to be a good hourly rate for $0.25/$0.50 6 handed NL, which is what I am played a lot of at the moment? Just want something to aim for. I think I am doing reasonably well at the moment at around $20 an hour, although it is probably early days and things could come crashing down around me sooner or later. Any input appreciated, thanks.