Is this based on the end calendar month, or does it roll over as you use it.
For example, if you use 0.5-hour on the 10th of the month, then 1-hour on the 15th, and 0.5-hour on the 20th, does the 2-hour subscription reset on the 1st of the next month, or do you get 0.5 back on the 10th of the next month, 1-hour on the 15-th, etc?
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