How long are babies night sleep hours

My 6mo won’t go to sleep earlier than 10-11pm. Then she’s up at 6-6:30 when hubby goes to work.

The. Is WIDE awake for a few hours and sleeps from 8:30/9 - 11/11:30

I hear people say their baby’s night time sleep hours are like 12 hours.

She still wakes up every 2-3 hours to nurse.

I don’t know if this is normal or what to do.