Is it legal to force an exempt salaried employee to work 7 or more days straight?

Question Details: I'm an exempt salaried employee who suppose to work 40 hours a week. We are starting a project at work and my boss is basically forcing me to work on the weekends as well on top of my normal hours. The weekends I would be on call, meaning I can't do anything because of the possibility of being called in to work. The project is expected to last 2 months. So my question is can they legally make me work more than 7 days a week for 2 months or more.

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