Generally 2-3 days, has been my experience with both Fuzzies and Dwarf Zebras. Normally when they start to feed is when they start to hang out in the open more.
I have had mine for months and he only really swims around when i put food in the tank. Then when the lights go out he swims around like crazy looking for food.
mine finally has come out but only for food too. im glade he is eatting but i want him to swim around like other peeps tank. i wonder if my water flow is too high. i am going to run an experiment??? hahaha