I pretty much have class all day long until about 4:00 usually. Then I typically go to work for a night shift until 8:00 and sometimes later. The hours can vary since I work in a restaurant. However, this semester I have a much heavier class load and so I cut back my hours at work to the weekends only and one week night. I don't think there's any magic number of hours, just what you personally feel you can handle without outdoing yourself. Ten to twenty hours is standard for part time, so schedule what you feel comfotable with in that range and try it out. If it's too much for you, cut back, if you're fine, then either stay with that or add some more. Just do what's best for you. 
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"The world is so exquisite with so much love and moral depth, that there is no reason to deceive ourselves with pretty stories for which there’s little good evidence. Far better it seems to me, in our vulnerability, is to look death in the eye and to be grateful every day for the brief but magnificent opportunity that life provides"
-Carl Sagan
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