Booyah!
Got checked by the transit cops both coming and going today, but my lunch meetup was perfectly timed to be heading home just before my outbound ride time was up. Same kids with the scanners both ways.
FWIW, #waterlooregion , the GRTpay app really maximizes your paid ride window. You don’t activate your 120 minute ticket until just as you step on the ride. No waiting 10 minutes after tapping on at the platform.