how long should baby feed?

Katherine • Hi! I'm 34, vegan, and expecting my first through natural conception. So excited to go through this experience!!
My daughter is 2 weeks old.  She was cluster feeding for about 5 days, but for the past few days she is sleeping more and eating less-I'm having to wake her to eat & she's only going 15 minutes.  She's gone from 3-4 hrs avg eating time to 2&1/2 hours (per day).  Is this normal?  She has always (since birth) slept 5-7 hours at night-waking once for a feeding.