Yeah 2-3 hours for us, I usually change her before I feed her or put her to bed. And I check after a nap if she has slept for a while.

ETA: It'll depend on the nappy re: if its wet or really wet... it'll take time to 'get to know your nappies' so to speak, you'll find out how long they last on your DD and get into a rhythm soon enough xxxx