How long will cooked potatoes stay fresh at room temperature?
Most Food Safety experts say to not leave potentially hazardous food out at room temperature for more than 2 hours.
That's interesting to use the word 'fresh' when speaking of cooked food.
How long it will last will depend upon how good it was when frozen and how it was thawed. If it was thawed at room temperature, it should be cooked immediately. If it wasn't fresh when frozen, it should be cooked immediately. If it was very fresh when frozen and was thawed in the fridge, then you should have at least a couple days to cook it.
Cooked crabs could keep up to two days in the refrigerator. That will depend on how fresh the crab was when cooked, how quickly the crab was cooled and refrigerated after cooking and how well the refrigerator maintains temperature. Make sure to use the coldest spot in the refrigerator (usually the bottom and not the top shelf).