no one can tell you for sure, because we've all had varying experiences with missing documents. the only thing for sure is that AOR (Which is not what your husband received) and SA will be delayed. How long depends on Missisauga. When we forgot a form, we were delayed 2 weeks in getting AOR and SA, and our application received date was recorded as a month after it was originally sent. There are some people from March and April who had missing documents who are STILL waiting for approval! Those of course are extreme cases.
The theory is in the missing doc letter, there is a certain amount of days listed for getting the information back to cic. In some situations, it seems CIC waits until THAT date (called the bring forward date) to continue processing, no matter when the information was received. When we sent in our missing form, CIC told my husband it could take 2-3 weeks for the form to be attached to the original document.
So really, there's no knowing for sure what will happen with your form. It's one of the mysteries of CIC that will never be solved. Just get it in as soon as you can. CIC will send an AOR once the application is considered complete. What your husband was sent is not technically an AOR, though it may provide a file number or UCI number to use for tracking purposes (over the phone, not on ECAS).
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Very disheartening news... Now we will have to wait 45 days after June 25th until I hear something regarding my SA?

! 55 days was enough now I have to wait even longer..... Will this delay his application when it gets sent to the London VO? His medicals expire January 24th.