Dungeons - When do they occur in the timeline?
The first dungeon Ascalonian Catacombs begins after you join your Order and after that it works their way up as you progress through the personal story. When they happen is shown as you progress through the personal story from letters you obtain from the member of Destiny Edge you befriend during your first part of Act 1.
In general, the dungeons and personal story steps are, in the timeline, done by order of level. If the dungeon is lower level than your personal story step, then the dungeon takes place before then.
The issue is when do they take place in between each particular quest?
Presumably, they’re happening alongside your personal story at some points. It’s sort of like a parallel series of events that you don’t get to fully see because you’re not always with the Destiny’s Edge members. Honestly, the question would vary depending on your choices and what events we’re talking about specifically. But, for example, the Ascalonian Catacombs would happen sometime during/after you joining the order, but before choosing the lesser race to support.
It’s most likely not a fine science. Why do you ask, out of curiosity?
I ask for the sake of immersion.
When does it makes sense to stop the personal story to work on a dungeon? Obviously if Claw Island is under Seiege it doesn’t make sense to go into Twilight Arbor halfway across the world.. So in between which quests do the dungeons even occur? Which specific quests?