Hey
I'm in Toronto too and this is what I do
Because TTC and Traffic can be a HUGE issue, parents are going to be late. It's just the way it is here.
If you call or text me and let me know, the charges continue at my regular charge because sometimes life gets in the way and I don't think clients should be punished because there was yet another accident or another delay on ttc.
However, if you do not let me know? it's a buck a minute (after about 5 minutes grace) because I let the kids know their parents are coming and then I have to deal with sad babies because mom is late.
Hope that helps