It depends on the source and audio encoding. Even across movies, a comfortable level isn't always the same volume setting.

Movies: 75-85
Music: 60-85
TV: 40-70

I do occasionally watch good quality music concerts at 93 and even on my relatively low-end system, it's clean, smooth and punchy and not fatiguing at all.

Chris
Srces: Wiim Pro | OSMC Vero 4K+
Procs: HD621 > G61R > Minidsp DDRC-88D
Spkrs: 7200.2 + 5KC + 5Ks | iNuke6K > USC15 | iNuke3K > 2 x Crowson T108SS
Video: JVC HD950 & 1.9m React3 2.4:1 screen
Room: 5.8x2.8m | Various GIK Panels