Following - my LG is four months too and wakes 1-2 times a night.
We normally start bedtime routine at 9pm (quite late I know!) she is in her cot in our room, it’s really hit and miss what she does, sometimes she will fall asleep after bath, bottle and bed at about half 10, on a good night she will sleep until about half 5 or 6am (happy mummy when she does that!) other times (like last night!) she slept until 12am, then woke up, did not go back to sleep until 1.30am where I had to give her another feed, then went back to sleep until 5am.
She was a tiny baby and still is at the moment so don’t expect her to be sleeping a solid 10 hours yet! The most she has done is 8 hours, but it’s been a few weeks since she has done that.
I am going to be putting her in her own room soon, my aim is when she can start rolling over as I will have to put the cot down a level, at that point I will be bringing her bedtime forward to about 8pm and then hoping she will go longer, I would still expect her to wake up around 12am-1am for a feed even then, still looking forward to her sleeping all night though.
I also think that when she’s in her own room she won’t be getting disturbed by us, (my partners snoring!) and I won’t be checking on her every other minute after every little thing she does in her sleep, so hopefully she will be more settled!
I know with my sister, her first baby slept from 7pm to 7am from 12 weeks! However, her second child did not sleep all night until she was about 10 months old.