Jon Moxley (fka Dean Ambrose in WWE) has been the AEW World Champion 3 times now.
1st reign: 277 days
2nd reign: 11 days
3rd reign: 59 days
Moxley now holds the record for most combined days as the AEW World Champion.
The previous record was held by Kenny Omega, who held the AEW World Title for 346 days in his only reign with the Title so far.