For your character's sake, it will depend on what stage the shop is at fiscally.
Is it just starting out? If so, he should be about what he needs to live on, and invest the rest back into the shop.
If the shop is losing money, he'll need to take even less in order to make ends meet. This is when the business starts looking for investors and such.
If he's at a point where he's solvent, he could start taking more than he needs. I take a little more than I need in order to run investments through a different LLC.