Is 10 mile bike ride in 50 min a good time?

I am training for a triathlon and recently sprained my fifth metatarsal in my left foot, so my doctor said I can't run for 2 weeks. Being that I'm a runner this really upset me, so I decided to work my biking and swimming for the 2 weeks. Well anyways I live in a golf course neighborhood(very hilly) and just biked 10 miles in 50 minutes. Is that a good time for it being so hilly?