Order the notes and try to proactively clear the review required (this is why it's best to Order notes 2 months post AOR). Once you know the reason for the review you can easily submit supporting documents via a webform.
It can take weeks to a few months depending on where you application is being processed and the agent in charge. No one can give you a timeline.
In 5th month cic told me that my eligibilty was in process so i sat quite, but now in 6th month, i got it is in review required, now waiting for my notes