My secondary character, Tohelo, reached 130M exp totals. Nothing special here, mostly some more or less standard solo exp.

As ranger (+mount from beastmasters), I can maintain almost 10k/min exp rate when killing 2k..15k monsters:

party status
,-----------------------------------------------------------------------------.
| Party Name: foo                          (Members:  1) | Exp Tot:    539928 |
| Created: Sun Jul 05 21:43:09 2026        ( 0h 54m 24s) | Exp/min:      9816 |
|========================================================|====================|
| Place  Name      Status      HP         SP        EP   | Lvl |   Experience |
|========================================================|=====|==============|
| 1.2  Tohelo         ldr  650(1686)   40(  40) 280(414) |  79 |       539928 |
`-----------------------------------------------------------------------------'

party kills
,-----------------------------------------------------------------------------.
| 22:16    6394: A seedy-looking human is poking around                       |
| 22:17   16506: A large puma-like monster stands here.                       |
| 22:17    5496: A seedy-looking human is poking around                       |
| 22:18    5424: A drow soldier is guarding this room.                        |
| 22:22    7317: Rilynt'tar maintenance crew                                  |
| 22:23    6593: Rilynt'tar maintenance crew                                  |
| 22:23   15411: A long green crocodile is crawling around                    |
| 22:24    6133: A robed drow wanders about, mumbling something.              |
| 22:24    3097: A drow soldier is guarding this room.                        |
| 22:25    7774: A drow priestess stands here.                                |
| 22:25   11713: A drow priestess stands here.                                |
| 22:29    2603: A giant bat flies around in circles                          |
| 22:30    2583: A lizard-man warrior is prowling the sewers.                 |
| 22:30    2416: A lizard-man warrior is prowling the sewers.                 |
| 22:30    7818: A dirt-covered troll is stomping around the timbers.         |
| 22:31    4949: A large, semi-transparent dog trots about                    |
| 22:31    7666: An ugly green-yellow slime is mucking about.                 |
| 22:31    5673: A seedy-looking human is poking around                       |
| 22:32   10738: A long green crocodile is crawling around                    |
| 22:36   39873: A bloated drider scuttles along the ceiling.                 |
`-----------------------------------------------------------------------------'

Bigger (possibly turbo) monsters, which are 20k or over, bring some trouble as they cause more damage what camping with Regeneration potions can restore.