Stolen from John
How much time should one contribute toward the development of the open source software they use? The concept of tithing comes to mind. Just contribute 5 or 10 percent of the time that you use open source software (OSS).
Example: Suppose you use OSS every day, all day, to do your work. Now say you work 40 hours a week (stop laughing!). Maybe only half of that time is on the computer (whatever). So we’ve got 20 hours a week of usage. Just an hour or two a week meets your quota. While that doesn’t sound like much, there are a lot of users out there. Multiply!
Two hours a week proofreading or updating documentation, doing some performance tuning and sharing your findings, whatever. Remember, you don’t have to be a coder to help The Cause.