Where did you get "lifetime" part? As far as I know MV cameras come with 3 year HW warranty.
It should start on the day you get them.
Thank you Simo-s_h and kYutobi. I understand that the purchase date of the MV series is the start date of the lifetime warranty.
Purchase is the start of warranty, yes, but there is no lifetime warranty in whole Meraki lineup.
Some indoor MR AP's have limited lifetime warranty as long as the license is active.