Yes you can have a single razor and do just fine. I can remember watching my Grandfather, in the early 1950's, shave with his only razor everyday. As far as I know it was his only straight razor. I also remember that on Saturdays he would go to his barber shop in Kansas City, Mo., for a haircut and a shave. Sundays was suit and tie day for church and family Sunday dinner. Sometimes he would take his razor and I think the barber touched up his blade. My Grandfather operated a Texaco station and exchanged services on the barbers car for his haircuts and shaves.
Sorry for the thread jack!