I don't think it would be physically possible to hit the Asia parks AND the US parks AND Paris. You could definitely do two or three of the Asian parks and get DL in the same calendar day because of the time difference and the fact that the flight is close to the same length as the time difference (for example, when came back from Shanghai, we left at 12:30 am Monday, arrived in Tokyo at 5 am Monday, had a lengthy day in Tokyo, then flew back and landed at SFO at 7:30 am Monday. But if you have to either a) fly west to hit Paris or b) fly east past LA to get all the way to Orlando, THEN fly back to hit Anaheim or c) hit Anaheim when it's open and then fly to Orlando and close out MK, I don't think it would work with the timezones and length of flights, let alone security/airport transportation/etc. Maybe option c during the old summer hours or for a hard-ticket something where MK is open until midnight. Even then, I think you'd probably max out at 4 cities' parks instead of 6.
That said, I have definitely seen articles/posts from people who have done all 6 gates in the US in the same day. That's not nearly as insane. Does require being able to park-hop early in the day, but it's do-able. IIRC, the first one I saw was a guy and his son and the goal was to ride something unique to each park in each park. This was back when it was much easier to get the World Passport that covered all US-based parks, but that's been a number of years.