Tickets come off of your abstract at three years. There are different types of abstracts, however. The three year abstract is the regular one, and if you apply for a job somewhere, it's going to be the one they request. Demerit Points come off of your abstract at 2 years. I think the next one is a 5 year abstract which has some more detailed info on it, and you can also order a complete abstract of your entire driving for approx 50$ by mailing in a request to the MTO. Here's the link - http://www.mto.gov.on.ca/english/dandv/ ... cord.shtml
It's from the conviction date (so the date you either a) pay the charge or b) plead guilty/get convicted in court). So you could choose to take your ticket to court and draw out the process, to delay having it go on your insurance for another year, if you felt so inclined (for example).
With Insurance companies, it depends. For the most part it's 3 years for tickets, but they may keep track of it for longer (the company may give extra deductions for having a clean record for longer, as one example). Suspensions are 6 years, accidents could be from anywhere to 5-10 years depending on the company. It's best to call your current company and find out.