Shouldn't you be including recovery time in that minimum?

Then you should also exclude the first few months, when (from what I've seen) aren't that bad.

Also, why focus on the minimum rather than the typical in practice

Because that's what my awesomeness-o-meter (which is what started this subthread) seems to respond to, especially given that Pragmatist put it in terms of sperm.

Let's call it 4*10^5 minutes, then. My response was to what is 'minimal obligatory'--assuming the obligation is placed by biology, rather than law or honor or reason. Over a lifetime of care, the differences vary more by couple than gender, I'd expect.