How long do you let baby fuss/cry at night?

Justyna • Mama to a toddler girl ♥️ and a newborn boy 💙

Okay, so I'm a very light sleeper and our son has been in his own room since about 3.5 weeks. After he gets up during the night and we do our business, he'll often fuss. I was just curious how long you let you baby fuss and/or cry for at night before going to soothe them. He is now 5 weeks.