seriously, how long could several hundred craws be left in a holding tank??
Within 3 days in a tank without food, they will start to get pretty hungry, may even start to eat each other. Without water changes in those three days, the water will start to get very high in ammonia and start to poison them. Temperature will also rise in those three days, given our current summer time heat, worsening the situation. 3 days is about what I'd expect before suffering begins in a unkept tank, but certain death depends on the size of tank, number of crawdads, temperature, food, & filtration/water changes.
