Okay the 10 minute grace doesn't apply in your situation but you should still try it.
Time Allowances/Grace Periods for Parking Offences
The City's Parking Ticket Cancellation Guidelines identifies time allowances for certain time-limited offences.
Time Allowance for On-Street Pay-and-Display Parking Offences
Customers who park on-street, in a permitted area where a pay-and-display reciept is required, and who receive a parking ticket within ten minutes of the expiry time of their paid-and-display receipt may have the ticket cancelled. A copy of the receipt showing purchased time and expiry time must be provided. The minimum time purchased must be no less than ten minutes and the receipt location must match the offence location in order to meet the cancellation conditions. The ten minute time allowance does not apply where parking is prohibited or on major arterial routes during rush hour periods.
http://www1.toronto.ca/wps/portal/c...410VgnVCM10000071d60f89RCRD&vgnextfmt=default