For reasons of being bored and to show it's not an easy feat I have compiled a list of wrestlers who held world titles (WWE, WHC, NWA, WCW, WCWI, AWA, TNA, ECW, ROH, IWGP, AJPW) for at least 1,000 days:
01: Verne Gagne: 4677
02: Bruno Sammartino: 4040
03: Ric Flair: 3783
04: Lou Thesz: 3749
05: Hulk Hogan: 3362
06: Nick Bockwinkel: 2990
07: Bob Backlund: 2138
08: The Great Muta: 1833
09: Harley Race: 1801
10: Mitsuharu Misawa: 1799
11: Dory Funk: 1563
12: Dan Severn: 1559
13: Shinya Hashimoto: 1307
14: Hiroshi Tanahashi: 1217+
15: John Cena: 1163
16: Gene Kiniski: 1159
17: Triple H: 1155
18: Adam Pearce: 1078
19: Jeff Jarrett: 1064
20: Pedro Morales: 1027
21: Vader: 1005
Aside from Severn and Pearce for obvious reasons and maybe Jarrett I think being on this list places you at an elite level. In any case it shows that you dominated and were on top of the cards for a long time, well above the "upper midcard".