How long can you keep crawfish alive in a walk in cooler?

After a couple days you will start to have dead ones.

After 5 days you would have at least 30% dead loss.

i know overnight and they are virtually all alive. never done it for longer than one night.

It will also depend on how tight they are packed and how moist you are able to keep them. I think 5 days is a little long but I have never done this for a living.

FWIW I ate some last night for the first this year and they were yummy. The claws were still very very small but the the tails are starting to grow. I say the bigger the better.

you can do it longer, but two days tops is my advice