Contractor Work Schedule

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Hello All, 

Just had a quick question about the average contractor work schedule. Do most GC's agree to work 7 days a week until the job is complete, or is it common place to have the weekends off where no work is being completed? The reason i ask is because we were driving around some of our prospective neighborhoods on the weekends (Driving for Dollars) and saw some properties that were obviously being worked on, but no one was on the job site. 

I feel that everyday would be critical in getting the job done in a timely manner, but was curious how it actually works when doing a rehab with a GC. 

Thanks