Depends on your skill with a strop and the particular razor. I think most people can go 2-6 months shaving every day without re-honing.

There was a story posted recently about an 80+ year old gentlman who had been using the same straight for his entire life with nothing but that razor and a strop. Never had it re-honed since the day he bought it, and was still getting perfect shaves.


Also, a simple barber hone, which can be had for $10-$40 can maintain a straight razor indefinitely if properly used. (provided you don't do anything clumsy to damage the edge)