I have a class at 9:30. I can take a GO bus that gets me to McMaster at 9:21, or I can take an earlier one that gets me there at 8:15. My class is in HSC 1A6.

Am I gonna have enough time to go from McMaster's GO station to HSC, or should I go an hour-ish earlier?

I would take the 9:21 now. With power walking, you should be able to make it in time, although you might feel rushed.

When winter comes along, I would probably take the 8:15 one. Snow might cause a bit of a delay in the bus service, and I wouldn't want to power walk in slush. Plus, you get extra time for hogging the seats next to you for your winter jacket.

Spoken like a true gentleman. Thank you.

HSC is very close to the GO stop, so even taking the 9:21 in the winter is fine. All you have to do is cut through ABB, and you'll be there in under 5 mins. Winter buses aren't ever delayed unless the snowfall is VERY heavy, but even then highways are the first places to be cleaned out.