Yes, Costco's return policy is the best anywhere. I returned a patio umbrella after 2 years (it rotted) and they happily refunded my money. That is not to suggest I take advantage of their system just that they are very willing to make the customer happy. If your Dolphin fails and you have the receipt they will have no problem exchanging it or giving you all your money back.

I can guarantee no other robot vendor will do that.

Anyway, my pool is an irregular kidney 18x36 vinyl. The cycle is 6 hours (this is the default - it is programmable though). I put it in before I go to bed and it's done when I wake up.

BTW, you'll have to buy it at costco.com. I have never seen the Dolphin in the B&M stores.