It's 40hrs per week.
However it's how you get those 40hrs that sucks.
As a new hire, expect no weekends off for at least 5-6years if you're lucky.
Expect split shifts. 4 hours on, 4off, 4on again. But only get paid for 8hrs.
Expect to work all hours of the day and night.
They are only obligated to give you 8hours off. So you may get a shift that ends at midnight but they expect you to be driving again at 8am. It's only 8 hours off work, they don't care about your commute, taking a shower, eating etc. As long as you have 8 hours off the job you can go back again.
As an Operator (bus, streetcar & subway)
If you are fairly new employee chances are you will have very long work days and unlikely to get a weekend off. If you have been there a while (10+ years) you can choose to work long or shorter times.
The more seniority you have the better work choices you have.
What is the work environment and culture Like at Toronto transit
8/hour & 40week
24/7, 10-12 hour shifts
Answered - Bus and Streetcar Operator (Current Employee) - Toronto, ON
Answered - Coach Operator (Current Employee) - City of Toronto, ON
Sporadic at best
Answered - Customer Service Representative (Current Employee) - Toronto, ON