Why do Korean Zen Buddhists bow 108 times?

We have 6 doors of perception:

sight,
sound,
smell,
touch,
taste and
thought.


There are 3 aspects of time:

past,
present and
future.


There are 2 conditions of the heart/mind:

pure or
impure.


There are 3 possible attitudes:

like,
dislike and
indifference.

Korean Buddhists use this formula 6 x 3 x 2 x 3 = 108 bows to cut through our Karma.

Source

https://www.quora.com/Why-do-Korean-Zen-Buddhists-bow-108-times