Nice puffer, any way to answer your question you could feed yours every 2-5 days depending on how fat he/she is after the last meal... also, if you haven't already done so, be prepared to possibly de-worm your puff if necessary... just look for any signs of IP's first though...
Oh i should also mention, Congos also eat live shrimp / crays as well... but again definitely try and quarantine first before feeding...