I have a total of 45 trays. I've been Googling and it seems to be 2 weeks per tray. My doctor told me to change mine every week

I have been doing Invisalign for over 15 years.In all this time, I have never seen any one instructed to wear their aligners for such a small time Only exception is if you are using a bone stimulator appliance, such as Propel

The invisalign system is designed for trays to be changed every two weeks.  This allows the time for the movement planned for each tray to occur.  Changing every week may speed up treatment, but I do not know if the amount of movement planned for each tray will have time to occur.  You should check with your doctor and confirm with him/her that he wants you to change them every week, and if so, if he sure that this will allow time for movement planned for each tray to occur.  Dr. Gary Braunstein

Hi Chilly. You should check with your doctor.  While its typical to change every week it is possible that you Doctor does want you to change every week.   But please make sure first.   Changing every week without being instructed by your dr could cause serious problems.  Hope that helps.Dr AlperAlperdmd.com