Note the first sentence of the description, where it says "actions taken within the next hour". That is your " initial time in which actions may be taken"
For questions that give both a yes and no answer --- First off, the spell should, at its most basic, tell whether the OVERALL result will be more beneficial for them, or not. It doesn't matter if it will be both, it will only give the biggest result.
Boon points could be used to extend that (i.e. so that they know that it will be both good and bad), but would require a more complex omen, such as their initial omen for something "good" being attacked by an omen for something bad, they struggle and then both fly off, with the stronger result being above the weaker result.
And don't forget that the spell only allows for them to ask a single question that MUST have a yes or no answer. If they ask something that cannot be answered in that manner, then they have wasted the spell, you should not give them their Spell Points back. I would only give them their spell points back if the question is one that IS a yes or no question, but which for soem reason just cannot be answered at that time (i.e. the future is too much in flux....)
Is that any help?