At the Toronto Airport, you currently have to park at the regular Daily Lot if you want to park for a month, however, the cost of the daily parking rate is around $30/day and can add up quickly in a month. This is because the long term lots at YYZ have been temporarily closed. Make sure to check the official website on closures. Another option is off-airport parking. Most off-airport parking lots allow cars to be parked for a month or even longer without any issue, and the cost can be as low as $5/day.