I do private tutoring in math, usually 1-2 hours a week. Optimally I'd do about 3-5 but no one has answered my ads lately. I charge $60/hr so that might be a reason haha. Still, it's fairly reasonable for a private tutor.
If you're looking for a job that pays $8-12/hour then you'd probably want more than a few hours a week. Perhaps you could handle that. Depends... will vary from person to person.