And technically speaking, you could, but remember that this takes time and effort, not to mention being something the Games Master would be well within his rights to limit as he sees fit.
As a base rule of thumb, I would treat this like therapy in the real world; no more than twice a week with a single one hour session each time and at least a month needed before any results occur. Continuing therapy to maintain the effect might even be appropriate, if the Games Master wishes to make things that complicated.
-August