There are 12 fights here. The enemies provide somewhere between 10 000 and 25 000 XP per battle (17 500 would be the average, then). After each battle, one character may get an extra 5 000 XP. So like 270 000 in total + a little something for completing all the battles. However, remember that's divided between your characters. For comparison:
Completing Planar Sphere gives you 45 500 XP per character (x6 is 273 000 XP), and that's just the final XP, without each individual XP gain for killing enemies, demons. According to the Wiki, during the Planar Sphere quest, you also get:
Tot Group XP includes:
So like another 149 750 XP. Now add XP for killing all the lesser enemies.
During my quests in general, you will always get a bit less XP than for major Act 2 and Act 3 quests.
It may be worth noting that you most likely won't get to fight all the battles right in the beginning, because you need to pay some gold for each test, and so over 40 000 in total (IIRC). The quest is supposed to be a new way of spending your gold.
Completing Planar Sphere gives you 45 500 XP per character (x6 is 273 000 XP), and that's just the final XP, without each individual XP gain for killing enemies, demons. According to the Wiki, during the Planar Sphere quest, you also get:
Tot Group XP includes:
- 17,500 Activate Sphere
- 23,500 Finish Golem
- 24,500 Rune Puzzle
- 28,750 Defeat Lavok
- 10,000 Demon Heart
- 45,500 Restore Engine
So like another 149 750 XP. Now add XP for killing all the lesser enemies.
During my quests in general, you will always get a bit less XP than for major Act 2 and Act 3 quests.
It may be worth noting that you most likely won't get to fight all the battles right in the beginning, because you need to pay some gold for each test, and so over 40 000 in total (IIRC). The quest is supposed to be a new way of spending your gold.

