Depends on how hungry your fish are most of the time but mine was able to last a week or so before there was nothing left

Going away for a holiday & don’t want to burden the neighbours with coming in or giving them a small tank to look after, bought this & easy peasy, wondered if they’d still be alive after two weeks, but they were and tank was clean.

Good product to have when you go on holidays. Seems to last for a very long time. Good to have so you don’t have to worry about getting someone in to feed fish when your away.

We had 2 in our 4 ft tank with a silly amount of fish. We left for 3 days and when we returned it was nearly all there.