They live 20 to 60 days, reaching full grown size in a 10 day or so period. This species is both male and female, but other species are heterosexual. They reproduce in fair numbers, cannibalize one another (unless REALLY well fed) until you have a half-dozen or so, and the process starts all over. You can also put the culture on "hold", by draining the tank and let the sand dry out in the bottom. Eggs remain in stasis for years or until they get wet again. Eggs hatch in 18-30 hours and they start all over again. Easy to keep them for an eternity. Mine are warm temp species T. longicaudatus, but you can get a larger species that does well at room temp Triops cancriformis.vary cool how long do thay live?