When would my 7 day pass end

Hello,

Myself and a group of 8 other people will be flying into Narita on May 2nd ~2:30P and are planning to buy the 7 day unlimited rail pass to get into Tokyo then travel to Kyoto and then Osaka, with a day trip to Nara squeezed in there. We fly out on the 9th around 3:30, though we'd get to the airport around noon.

My question is, would the 7 day pass extend from Monday - Monday and our trip would be covered, or would it end on Sunday?

Thank you for your help!