Changing Trays Every Week vs Every Two Weeks Hi everyone!

I just started Invisalign a few weeks ago. I am currently on my 3rd out of 36 trays. My orthodontist told me that I will be changing the first 3 trays weekly and the following 33 trays every two weeks. The entire treatment will last 1-1.5 years, maybe 2 years.

I’ve been reading that many people change all of their trays every week. Is there a reason why some people are told to change their trays more often than others?

Just curious. Thanks! :)