If it's 10 points per month, how long is a month?

Does the period 01 Feb to 01 Mar count for the same number of points as the period 01 Aug to 01 Sep? What about on leap years? Sorry, let me put on my übergeek spectacles...

There.
Unless we go for something overly complicated and/or stay with DGP's method, when the database does its calculation, it's going to subtract the publication date from the current date to find the number of days the cache has been active, then multiply it by a factor to get the total points available. I suppose for DGP that factor would be (100/365) or 0.27397260... points per day = 100 points in a year (Julian year, technically, but you don't want to get me started). I think 120 points/year (0.32876712... pts/day) is a reasonable factor to use, which would give an
average of 10 points per month. For codifying this, let's stay to points per day or an another interval that has a fixed (or mostly fixed) number of days. A month, unfortunately, is the most ambiguous measurement in our calendar.
Okay, übergeek off.

Normal geek mode.
Just another idea to be different yet the same: 2 points per week. That gives you on average 104.285 points per year (104.571 in a leap year).... Yeah, not a great improvement, but there is no common factor to 365, ~28-31, and 7, so there is no magic number that will be convenient to anyone. If there were, our calendar would probably be a lot simpler!