Thanks for the replies guys!

This concerns me still, 1) They have up to one hour to say "we still need you" but no you don't have to be at airport.

If they call me back within an hour, do I have 90 minutes to return to airport?

Also co-domicile? Does trip have to finish where it originated? Is transportation provided if not?

Many more but I'll wait for the roadshows! Thanks again guys!