I am currently making a monk subclass named Way of Peace, and I'm thinking about adding a level 11 ability that will allow a monk to meditate for ten minutes and replenish all their ki points. I would like to know if that's not a long enough time or if resetting their ki is overpowered.

It is overpowered when short rest is usually defined as 1 hour long.  You might consider reducing the amount Ki recovered to something like 4 points.

Thanks, will do.

I think PHB allows full ki restore with 1hour rest... Perhaps the Elf might be able to use racial trance option to shorten it to 10 min?

Optionally, maybe give a feat that can double an existing ki point with an action or maybe when taking a Ready or Dodge action?