Fine, I’ll do the math:

60 seconds in a minute (10 × 6)

60 minutes in an hour (9 × 5 × 4 / 3)

24 hours in a day (8 × 3)

7 days in a week (7)

6 weeks (3 × 2)

The bold 3’s cancel out and become × 1, and then it’s easy to see each integer from 1 to 10 appears exactly once when it’s all multiplied together.

It took me way too long to understand the joke, I may be fucking dumb

Okay, but did he pronounce it as “Ten factorial”‽‽‽‽‽