I did this a few years ago. Biggest problem I found was boredom, I was using the same razor every day to make it easier to keep track of the # of shaves. More stropping was definitely the key, esp on the linen side. Anyway I wound up with a few razors with 120-150 shaves on them and still going strong. I really don't know what my upper limit might be - my boredom eventually overcame my curiosity.