Tummy time

Hello, I like to know how you mummies incorporate tummy time into your LO scheduled currently my LO is 5 weeks old and he has been really sleepy after feed, hence I couldn’t find a chance to have tummy time with him. Even if at times he is alert after feed, I understand that we need to wait a while before we can do tummy time. Hence by then he would want to sleep and is cranky. How do u all incorporate tummy time, how long is each session for a newborn? How long do u all wait for feed?