Rephrasing the question to "Can you do everything in the MK in one day?" The answer is yes, and it is not that difficult. I have done it recently. The hardest part is finding a day when everything is open (no refurbs). On 5/22/17 I did all 42 attractions and was done by 4:45 PM. I don't consider the shooting gallery an official attraction although I could have easily added it.
1. Get fast passes for Peter Pan, 7DMT & Splash
2. Choose a day when there is MK morning Magic Hours, be there at rope drop. Save all "shows" until the afternoon.
3. Quickly knock off, Pooh, Barnstormer, Dumbo, Teacups, Speedway, Orbiter, Buzz, Trolley Car. I did all of these by 9AM and crowds were not there yet.
4. Head to Adventure land, do Tarzan, Aladdin, Jungle Cruise, get to Haunted Mansion, then back to Pirates. Use first fast pass for Splash. Take raft to TS Island, get off, set foot on the island and get right back on the raft.
5. Take RR to Fantasyland, hit, Mermaid, then jump to Carousel, Philharmagic, use FP for Pan, then Small World. Crowds and now present so SM was first line I had to wait in, but not bad. It's around noon. Hit Riverboat. Use FP for Mine Train.
6. Head to Tomorrowland. I was prepared to wait in line, but got very lucky and was able to snag a 4th FP for Space. It's now about 2PM and all I have left are shows and BTM. Now I'm just jumping from show to show with TTA in between. Sequence was Laugh Floor, Stitch, Carousel of Progress, TTA, Presidents, Country Bears, Tiki. Finally I went and waited inline for BTM. Hit that line at 4:45 PM. Done.