Other sites have close reasons such as 'too localized' which basically means that a question is not likely to help many other visitors aside from the OP, and this is also generally used for timebound questions.
I think it's a good question, but the information will be out of date soon. Granted, the question can become the 'goto' for all similar questions in the future (which would be closed as duplicates since this question answers the broader question - how do I determine the best time of day and frequency for communicating between point A and point B?), but we may want to modify the existing question to make that clear if so.
If we want to allow these then that is alright, so long as we're OK with the precedent this sets for hundreds if not thousands more of these questions which will be answered by referring back to the same resources (VOACAP, ARRL propogation forecasts, etc.).