hey there. not sure how old your lo is, but i assume she`s still pretty young. if she`s sleeping so well at her naps then i`d say you`re probably spot on with the activity time at the moment....leave it any longer and she`ll be overtired and won`t sleep, much less and she won`t be tired enough and won`t sleep!! so don`t change the acitivity time while it`s working so well. when dd used to sleep though feedtime (some babies are just really sleepy) i`d let her go about an hour over, but then wake her to feed her..in the early days it`s important to get enough feed into them during the day so they don`t have to feed so much at night.. the key is not to let them sleep so long that they miss out a whole feed cycle. hope this helps.