you may remove the first x letter of your ID and try again.
as for your questions:
in most cases, 6-8 months, although some people have waited for longer
yes, it starts when they receive the complete application
not at all accurate, can be anywhere from 6 months to 30 months
they may ask you to submit everything again if there is any update, and medical if your medical has expired, you can request GCMS notes to see what's in your file but 6 months is a bit too short for that, I'd give them a few extra weeks.
https://www.cbsa-asfc.gc.ca/agency-agence/reports-rapports/pia-efvp/atip-aiprp/req-dem-info-eng.html
it's for free if you do it under the Privacy Act.