3 days a week, having each practice being over 1 hour. That should be enough for keeping your skill as well as improving it at a steady rate.....(just my personal opinion). you could always go to more, but i think for your situation 3 is fine (your not going for any tournaments or grading)
it also depends on the difficulty of the class. the less intensive it is, the more you should go to.
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-Chuck Norris-
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