a long time to become accustomed to their new owners and environment.
if possible, try to pick up the hedgehog to gauge its reaction - try to choose one that will allow itself to be picked up and maybe even turned on its back without rolling into a tight ball and staying there. but remember you are a new smell and voice so even the best babies will be a little nervous the first week or so.
look for bright eyes, clear nostrils, and healthy looking skin, quills and fur. watch out for flaky skin, missing quills, or discharge around the eyes or nose. also make sure the hedgehog is in good 