Until you have a logical reason to believe something has changed. You have to start by presuming the original answer you got was correct and took into account most ouside variables. We can change the future, but it is something that usually has to be done consciously and takes work. So if none of the other participants knew the contents of the reading, you can presume they acted as predicted.
The querent, on the other hand, who has seen the future, can change it. Sometimes just knowing the future changes our attitude towards it and that can change the future in and of itself.
So my answer to that is I would say you should wait until you see signs that something has changed. Let's say that the original question was about "X" who was treating you a certain way and what will that lead to in the future. And he has stopped treating you that way...Or to give it a time frame, probably at least two months, and not less than one.
To me that is what you should do, but when you're worried about something, I think we all have a hard time waiting to do a new reading and we need reassurance now. I'm sure most people have been guilty of doing another reading too soon at some point.
I know I just did that myself yesterday. I asked what my future was with someone, something I have been asking a lot lately (way too much!) and instead of answering directly the cards told me that I need to stop and examine why I do not trust what I am being told, why I do not trust in grace (that power) that always sends us what we need for things to work out for the best along with signs on how to achieve it)...
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