Using 4.x as a guide, it's around 1 minor release per year.
Waiting a month or two for a feature seems completely reasonable. Waiting a year for it seems onerous.
4.x is completely irrelevant, because we only switched to the approach that 3rd digit releases contain only bug fixes at a very late stage. In the 4.0/4.1 (and maybe 4.2 as well, I don't remember) branches, each 3rd digit release contained plenty of new functionality. 2nd digit releases symbolized major changes in architecture/compatibility/etc.
Zeev
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