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@DFP
It all depends on the person. 48/17 on 650c is about 80" which is pretty high, but some people manage higher.
On a single speed Id say its better to go too low than too high as most of you pedalling will occur uphill with plenty of coasting downhill. If the bike is some old heavy beater with lots of drag, more reason to go even lower. If it is something well setup, light and racey then a bit higher.
60-70" I reckon, depending on her. Swaying to the lower end. But bear in mind a lot of people get more out of breath spinning a low gear rather than heaving a high one. And with a too low gear, top speed will be limited and infuriating, more so than with fixed. Fixed wheels are fun even when you are spinning out, freewheels get awkward.