Hi Monica,
Unfortunately it would be very difficult to put a time on how long INZ would take to process your PR as it varies greatly depending on which branch you're dealing with, how busy they are, whether you have a job offer or not, how quickly they want to put your skills to good use and also whether there are any other issues to deal with e.g. in your case, the possibility of a medical waiver, which could hold things up. A PR application can take anything from a couple of months to go through to up to a year or more if things don't run smoothly.
150 points is a very good score and one that should normally see you through the PR process fairly quickly but, if you need to apply for a medical waiver, I really wouldn't like to say how much extra time would be involved with that.
Sorry I can't be more specific.
