Having been to YUL (and YYZ) a few times over the past decade, I really should know this, but ...

How far in advance should I arrive at YUL for a flight back to the US? I'm guessing it doesn't require the full cushion (2.5-3 hours) for TATL/TPAC travel, but I'm wary of needing to pre-clear US immigration as well as the usual checkin and security. For a 6pm departure on a Friday, would 2 hours be enough?

As long as I'm asking dumb questions, what about the outbound (DCA-PHL-YUL)? I'm thinking it will require only slightly longer than for domestic travel, so 90 minutes prior to departure?

Will be checking bags each way, but in theory that shouldn't add much time since I have *A status.

Thanks for any and all input.