My daughter is also 9 weeks old and her awake time varies from day to day. When I feed her in the morning, (usually 7 a.m.) she will eat and fall asleep, then sleep for 1 hour and 30 minutes, and then eat and sleep agin (the cycle repeats itself) Her awake time is usually in the afternoon and in the evening - and somewhere in between there she will feed/sleep. We will do some activity time in the afternoon - she will yawn when she has had enough of her activity time. I usually follow my daughter's lead and let her sleep when she wants to.