I whole heartedly do not agree with your suggestion on asking for MAX time.
If you only need a month then why "clutter" the system by asking for 24 months? That's a bit of an abuse of the system and exactly why our Drone NOTAM system is locked down as tight as it is now. Operators were putting NOTAMS up for months on end when they literally only needed a day or so but they wanted to be able to fly "just in case something comes up".
Aviation is about detail accuracy and you should request what you need.