Use 30 minute whereever you need, work time is better for joining the wings and alligning the stab, but 45min -1hr will be even better. As the room is hotter in summers it cures a lot faster with 30 min, my working time is about 10-12 minutes now, and not enough for alligning things.

For proper allignment and cleaning things something more than 30 min will be better, 30 min or 45 min.