I usually find myself ready to leave the hotel a few minutes early. Between that and the van ride in, I take the time to get in a review.
Am I getting paid? On the surface, some will argue you're not.

But this is being "efficient". And companies that have efficiency in their processes and their employees actions will benefit. And that benefit might get passed on in the next contract negotiation.

After a 20+ hour layover, I don't feel the need to nothing until I step into the cockpit... and then to start rushing.

YMMV.