Great question, Tony! Blade lifespan will definitely vary a bit based on your particular hair type, shave schedule, and blade care habits. While there's no exact standard for how long a cartridge will last you, we find that the average person likes to replace blades every 6-8 shaves. The idea is that our blades are durable and will last a long time, at a great price.

I believe it's recommended that you replace them weekly assuming you shave daily. So 7 uses? I usually use one blade for one month since I only shave about twice a week on average.

Mine last about 7 to 8 days. My beard is heavy due to my Sicilian ancestry! I will never go back to Gillette!