@"Maxine Peskens" I wouldn't worry too much about this question, as schools are aware of the difficulty in predicting this. Just make a guess at what you think you would do, and - if answering yes - don't put too many hours.
The schools I toured said don't work during your first year of law school unless you absolutely need to. Working during 2nd and 3rd year seemed like a personal preference, but 20 hours or less during the school year.
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I know a few schools do not allow 1Ls to work at all.