Feeding duration for 2 weeks old?

My son is 2 weeks old today and in the last couple of nights and 1 day, he’s not feeding well (I don’t think).

Before this, he woke up to feed like clock work - every 3 hours and maybe just over 3 hours at night. And he was feeding between 25-40mn.

And now, his feeding time is all over the place and he feeds between 5mn and 15mn then stops and looks like he wants to sleep so I put him to sleep then 5mn after he’s in his bassinet, he starts crying and showing signs of wanting to feed again.

Is 15mn feeding duration max normal for 2 weeks old? Is there sth wrong? Help pls!