Hey, I did not reschedule that far out. My initial date and new date was well within a month.
However, I remember reading on a Facebook group (don't quote me on this) that there was a person asking to reschedule after 3-4 months and once they got back to Canada, they got their new date the...
Depending on where you are! My coworker and I are both residing in the GTA, and she got hers rescheduled to a week after her old date; and for me, a week after I came back to Canada.
So I would say, for GTA area, quite fast!
I used my OHIP (Ontario Health Card). I asked them if I could use the temporary one (the paper one) and they said yes, in case I needed it urgently; otherwise, I would need to show them the official, laminated OHIP card.