@sass With my first it was once she was sleeping for 5 or more hours in a block, as 5 hours is my minimum for functionality. So when she started having a 10 to 11pm bottle and then would wake up for another anytime from 4, I counted that as sleeping through. She was doing this from about 3 months old.
My second born on the other hand, she is 6 months old, and I consider it a good night if she only wakes up for one bottle. Usually she has a bottle at 6pm, is in bed around 7pm, wakes up at 10 to 11 for another bottle, and then again at 3 or 4. It wouldn't be so bad, except she is the complete opposite of her sister who would fall asleep while having a feed and could be transfered straight to bed. This one is wide awake and ready to party, needs to be sat up so she can self burp otherwise she still might have the occasional spew, and then takes forever to settle. Sometimes over an hour. Has to be deeply asleep to transfer to cot otherwise we start again. Absolutely no self soothing skills.
I go back to work in 3 months, I hope something changes in that time.