So the article says that it would take 2 hours for a TO-MTL trip. Guessing that's about 600km, the train would travle at 300km/h.
So here's the approxomate timetables for OT,TO,MTL and QC
OT-TO 500km : 1h40 TO-MTL 600km : 2h MTL-QC 300km : 1h
OT-MTL 200km : 35min TO-QC 100km: 3h
OT-QC 500km : 1h40