immediate action rerolls spells and abilities vs extended period tests

[Stephen Ede]

How do abilities that allow or force a creature to reroll a D20 roll as an Immediate action work against checks that are carried out over minutes, hours or even days?

For example a Diplomacy check to gather information over 1-4 hours, or a Spell craft check for crafting an item over 7 days.
Obviously the these checks are made as a single roll but that roll represents an action over a vast amount of time.
Does the creature only need to be a valid target at the moment the roll is made, and what happens in the case of Gather Information where, unlike crafting a magic item, it doesn't even specify when the roll is made. Or do you need to have the creature in range for targeting the entire period?

Or can you simply not use such abilities on actions spread out over more than a round or a minute?

Any cites would be appreciated but even some good theories would be useful because I haven't managed to find anything relevant so far.

The Witches Curse and the Oracle Misfortune abilities leap to mind as examples of the problem but they are far form the only example.

Thanks

[Diego Rossi]

When enchanting magic items people normally take 10, so most curses would force them to take the worse 10.

For things like the Witch Misfortune (you mean that with Witches Curse?) you affect the die roll the target will make within a few seconds. He can easily delay making the roll for a few minutes when completing an activity that last hours or days.

The oracle misfortune make them reroll a dice they just rolled. I find hard to accept that you will be present exactly when the guy is completing the item.

The rules are silent on the matter, so it is a matter of taste, but those abilities are meant to affect things that have just a happened or will happen in a few seconds, so having them affect an activity that last hours or days seem questionable.

On the other hand I can envision how it could work for some activity:
- a contest where people are preparing some work of art that can be irreparably damaged by a blunder, like a statue. The misfortune can them have a mishap exactly when they are doing the finishing touches. A bad blow with the hammer and the chisel will sever an arm of the statue, lowering the quality of the work.
- crafting magic items it could make you miss the drawing of a critical symbol on the item.

For things like gather informations that wouldn't work as you are speaking with several people around the town, there isn't a critical moment where a blunder can ruin all your work.

Essentially: ask your GM.