Nursing My 2 Week Old

I’m a FTM, 26. My boy is 2 weeks old today and I’ve been finding that he nurses for an average of 5-10 minutes (on one breast). His pediatrician said that he needs to nurse for 15 minutes on each breast in order to get the foremilk and the hindmilk. But I’ve read on many, many different websites that nursing sessions can take anywhere from 5 minutes to 45 minutes. My question is, if he nurses on for example, my left side, for under 15 minutes (which he almost ALWAYS does), next time I nursed him, can I put him back on the same breast to make sure he gets the entirety of the milk?