How long is a standard ten‑pin bowling lane from the foul line to the headpin?

Simo, if you look at the end of your leg you will find a foot and if you measure your foot from the heel to the big toe it will be approximately 12” which equals 1 foot.

Americanism. I have not got a clue what a foot is. And do not pretend it is an American sport and that is why you use feet.