Good advice from Bob. I'm glad your director cut you some slack. The general rule is to rest and then slowly get back into your routine. But there's no hard-and-fast formula. It wouldn't be wrong to rest both Saturday and Sunday, if you need it. If you feel good on Sunday, maybe do some easy practicing. However, if you still feel stiff on Sunday, then maybe take a couple minutes to play an easy warm-up around G to C on the staff. Then put the trumpet away. Maybe repeat the short warm-up towards the end of the day. Then see how things feel on Monday.