clearstream
(He, Him)
That's a helpful summary I think. So with 2) and 3) players can apply guidance regardless of how long the task takes. That could be okay, unless one is motivated by a desire to limit the range of tasks guidance can apply to.I've seen at least two possible good rulings already in this thread.
1) The check happens at the end of the action and if the guidance duration covers the entire action it works.
2) The check happens at the end of the action and as long as the guidance duration is present for part of the action, it works.
I skipped some posts, so it's entirely possible that there are more good rulings.
I see 3) The check happens at the beginning and guidance works, as another good ruling.
1) provides a fairly strict limitation, and a DM might have others in mind also. For me, one issue with 1) is that it seems pretty arbitrary about what skills can get guidance in a way that just doesn't really gel with my idea of how divine magic might work. The razor is time it takes to do the task, not nature of task! Well, I suppose one could apply both but... also weird.