When did your baby sleep through the night?

Just looking for the light at the end of the no sleep tunnel. LO is 6 weeks, formula fed, eating about 3 oz every feeding, except her bedtime feeding which we usually do about 4 oz. I know she’s still young and it’s normal, but she’s still up every 2 hours, MAYBE 3 if we’re lucky. The longest stretch she’s done is 4 hours once. I’ve tried upping her feeding to 4 oz during the day but she still seems to only want to take 3. Is this a normal feeding amount for her age? Also, when did your baby start sleeping through the night/longer stretches?