Tell it the cities you are weighing up and the total days you have; it splits those days across them, proportionally to how long we actually stayed in each place. The numbers come from 195 dated stops, not an invented average.
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Every duration is a real stay length lifted from our route file — 195 dated stops. Ask for fewer days than we took and the split scales down proportionally, with a floor of one day, or two for cities we stayed four nights or more in, since those are never day-trip material.
The honest caveat: our route was a long one, so our day counts are generous. Treat them as the comfortable version of each city, then cut.