While I was active, we had study hours that were required for candidates, suggested for actives, and required for anyone with a GPA lower than the Chapter standard. Often times, study hours were "excused" if the individual had to meet with a specific study group for a class project (as long as studying is accomplished, it didn't have to be at the Chapter's study-site).
I've never heard of study hours being considered hazing. Every greek organization I know of puts a high value on academics, and set study hours is a way of making sure that pledges/new members do study, and balance their responsibility/excitement of being greek with their main reason for being in college.
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equeen
A Lioness has her Pride!
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Alpha Sigma Kappa - Women in Technical Studies