There's a thread on b&b where some guy did. If I remember rightly it was well over 100 shaves!Probably a Mach 3 used to go months without changing the blade, I did use the black rubber blade stropper/sharpener/cleaner though, worked well. Anyone tried it with a DE blade?
Edit: found it!
http://badgerandblade.com/vb/showthread.php/306177-DE-razor-and-Razorpit®