Aeonx.
The duration of a horary reading is not particularly clear. All the horary astrologers that I've read accept that the reading is of limited duration because things change. What 'limited' means though is not easily answered, especially if time is not an element in the question. There are some circumstances in which the length of time that the reading will hold is reasonably clear.
If you ask the question will I get a promotion at work in the next six months and the answer is no, then I would take the reading as being valid only for the next six months (or any other time period chosen by the querent).
Some questions ask for a time period as an answer - how long will it take me to get my promotion at work? - would be an example. Again there are horary techniques for trying to estimate the time (they are probably no more precise than trying to fix a time period in a tarot reading). so if the reading suggests that you will get a promotion in the next six months, I would take it as valid only for that period.
On your last point I think you need to be more precise as to what you mean by 'turn out'. The outcome could be one of several things, such as marriage, engagement, living together, separating, remaining much as you are now or anywhere in between.
Ask yourself what you hope will come of the relationship - and ask about that - for example Will we still be together in six months, or Will the relationship result in marriage (or whatever).