Editing Yagura:SRD:Skills Summary (section)

===Retraining===

There will be situations where a skill in which you have never invested points becomes a skill you need to use; that's where retraining comes in. To retrain, you first dedicate some time to the process, and at the end of that time you move skill ranks from skill to skill. The days spent must be consecutive, but regardless of when you decide to stop, the days spent retraining determine the number of skill ranks you may shift around.

It takes six days to retrain a number of ranks equal to your level + 3 (which is the maximum rank you can have in a class skill). Retraining less than six days retrains less ranks in skills - just divide the max by 6, round down, and that's how many ranks you retrain in a day. You may draw skill ranks from any number of different skills, and retrain those ranks to any combination of skills. The number of ranks you have in a skill after retraining still cannot exceed the maximum determined by your level and class skill list.