It seems like a presentable person was supposed to shave twice a day, in the morning and after work. Considering that you need to make three passes to shave well it would make 6 passes a day.

I tend to replace blades after about 5–10 shaves, so 15–30 passes, but I heard of people replacing after each pass. Some brands may also stay sharp for longer, giving even more spread to numbers.

All-in-all, it seems like one can expect to produce from 70 to more than 2000 disposed blades per year. At a thickness of about 0.1 mm it would be something between 7mm/year and more than 0.2 meters/year

Now I really think that even the most sensitive skin doesn't require you to change a blade after each pass. I also find it hard to imagine producing a pile of blades a meter high in 4.5 years