I usually have stopped my monk guild quests to the monk tree as later ones require more time and power to complete. However, since I have now a more powerful monk build, I decided to try the first “solo X amount of exp” quest.

break seal
You break the seal.
You now have one hour to collect the required experience. Quitting will abort the task. Only solo experience counts for this task.
You discard the pieces.
Hp:938/938 Sp:763/1247 Ep:407/411 Money:14558+305025 23 kgs Exp:9570 Eq:monkbattle C:200,94|21:37|
...
You are ahead, keep it that way! You still have 33min and 40s left, and you've gathered 80 % of the needed 320000 experience.
Hp:263/941 Sp:679/1241 Ep:313/411 Money:17087+305025 23 kgs Exp:268186 Eq:monkbattle C:199,81|22:03|
...
You have gathered the experience required within the time limit.
You still had 25min and 4s left. The trouble is, your actions have attracted the attention of an elemental lord. It will soon appear to wreak havoc on your sorry self. You can't just leave it wandering around -- you need to subjugate or defeat it. For this task having a party might help. If you die to the lord, you will have to try again later.
Hp:905/1182 Sp:755/1107 Ep:191/411 Money:17391+305025 23 kgs Exp:336791 Eq:monkbattle C:342,140|22:11|

So, 320k exp soloed in 35 minutes. I think I could do the next one also, but third quest could get tricky or at least need some preparations.

The quest also involved killing an elemental lord:

an air mephit lord, furious at Thelo

The lord was about 51k exp, and I got it killed in 15 minutes.

You are prepared to do the skill.
You run up Someone's chest, kicking back hard enough to make it cough up blood!
As you backflip back, you *thwok* your foot against its chin!
Someone exclaims 'Bested! By a mere mortal! Shame on me!'
Someone buries its face in its palms.
Someone goes *plop* and vanishes, subjugated.
As the elemental being vanishes, you have completed the task. Congratulations!
New bonus gained: Access to first elemental ki-power of your choice: air.
New bonus gained: Access to Unsu kata.
...
| 22:25   51791: an air mephit lord, furious at Thelo                         |

In total, the quest took 50 minutes. Here are the last party kills and the final party status:

p kills
,-----------------------------------------------------------------------------.
| 21:43    9005: A dirt-covered troll is stomping around the timbers.         |
| 21:46    3476: An enormous sewer rat is gnawing on something                |
| 21:48    6780: An elven warrior is searching the tunnel                     |
| 21:48   11715: a curious air mephit, annoying Thelo                         |
| 21:50   12738: An ugly green-yellow slime is mucking about.                 |
| 21:51   14420: A large stone-coloured lizard sits here quietly.             |
| 21:51    3590: A giant bat flies around in circles                          |
| 21:52   19292: A bloated drider scuttles along the ceiling.                 |
| 21:54   14913: a clever air mephit, annoying Thelo                          |
| 21:55    4596: A large yellow scorpion is lurking here                      |
| 21:55    7478: A drow priestess stands here.                                |
| 21:56    5915: A drow priestess stands here.                                |
| 21:56   10686: An ugly green pillar-shaped demon has been summoned here.    |
| 21:57   20342: A drow wearing green and black stands here.                  |
| 22:03   27872: a sneaky air mephit, annoying Thelo                          |
| 22:04   21344: A drow priestess looks around for unbelievers.               |
| 22:10   22776: a deadly and sinister spider with a cross-pattern on its bac |
| 22:11    8145: a disheartened phantom of a grasshopper                      |
| 22:11   14176: a mad spectre of a soldier ant                               |
| 22:25   51791: an air mephit lord, furious at Thelo                         |
`-----------------------------------------------------------------------------'
p status
,-----------------------------------------------------------------------------.
| Party Name: soolosaato                   (Members:  1) | Exp Tot:    374867 |
| Created: Fri May 09 21:36:27 2025        ( 0h 49m 46s) | Exp/min:      7497 |
|========================================================|====================|
| Place  Name      Status      HP         SP        EP   | Lvl |   Experience |
|========================================================|=====|==============|
| 1.2  Thelo          ldr  941( 941)  481(1241) 411(411) |  97 |       374867 |
`-----------------------------------------------------------------------------'