I have astigmatism so I can't wear ones that you can leave in overnight, I have 30 day take in-take out contacts. I don't wear them often, I really think their shelf life is 30 days, not 30 days of wear because I recently got one totally stuck in my eye. I had to claw it out with my fingernail and broke a bunch of capillaries and bruised my eyeball. I only had the fracking thing in for 12 hours.