How Long to Boil Gnocchi
You should expect it to take about 3 to 5 minutes to boil gnocchi before it's ready to serve. Frozen gnocchi does not need more time to boil than fresh gnocchi and does not even need to be thawed before putting it into the boiling water.
You can tell when this type of pasta is fully cooked when the pieces of gnocchi rise to the top of the water. Once the gnocchi float to the surface, you should remove them from the boiling water as soon as possible; otherwise, you risk overcooking them, which could turn them to mush.