When did your breastfed baby start sleeping through the night?

B

So I’m aware that formula is more filling for baby than breast milk but I was still surprised to see comments on here that some of your formula fed babies were sleeping 5/6 through the night at month old 😮 I exclusively breastfeed and my little one goes around 3hrs tops! He was 4 weeks yesterday. When can I roughly expect him to start sleeping in longer chunks?

Edit: thanks everyone for your replies! I knew all babies are different but I thought there may be a general time for most babies, but that clearly isn’t the case!