C/D - the Nexus line in ottawa only operates certain hours. If you’re clearing security outside of these hours it dumps you into the regular queue (at the front at least) which will be slower.

if you’re clearing during nexus hours I think 15 minutes after bag drop is adequate to reach your gate. If outside nexus hours maybe 25 minutes. Make sure you base your times off the boarding time not the departure time. Bag drop will also have a deadline - likely around an hour before departure.

nexus hours - The full service line is open during peak hours (4:00 - 8:00 a.m. and 2:30 - 6:30 p.m.) and the front-of-the-line service is open 8:00 a.m. - 2:30 p.m. and 6:30 - 11:00 p.m.