Time nursing

Jen

My baby girl used to nurse for about 20-30 minutes one side but now she seems to only do 15-20 one side. Is she just more efficient? If she was still hungry I’m sure she would let me know? I tried to change her and burp her and nurse again but she just seems to be tired and just uses it as a pacifier no swallowing. Is this normal? She is 6 weeks old.