Normally takes 2-3 days to print and send, and then 3-4 days to receive, but I have known it to be done sooner than that, I recieved my son’s renewal 2 days after it approved, so it just depends.
When did you send your documents to the passport office? I have sent an extra document incase they need it, so avoid any hold ups as need passport for 4th April, just trying to work out roughly went they may upload it