as long as there lifted as soon as layed they will last for months dont put them in a fridge just in a box on top of a cuboard keep them at room temp turn them every other day and wipe them with a damp cloth to stop them drying out up to 6 weeks 1oo percent will hatch then it can drop 1 or 2 percent every two weeks longer than 6 to 8 weeks hope this helps you m8