Premature Baby and Sleep

My daughter was born 3 weeks early. She's 8 weeks now and almost 8 lbs, eats 2-3 oz every 2-3 hours. Because she's still small, and only eating ~3oz a feeding, I know we are nowhere near getting longer periods of sleep. She sees her pediatrician Monday so I'm sure I'll get reassurance that the end of this "newborn" sleep pattern is almost at an end... but, When did your baby start sleeping 3+ hours a night? Premature or not, I need to know this will be over one day. 😭 So exhausted!