wa-wa-world, the last point from the first post in the thread:
Your heirs are allowed a maximum of 49 days vacation. You can use these days for vacation/University and/or Time Travel. You gain 7 days at the birth of every new generation. Spouses & spares have no vacation restrictions.
So, if only two of your proposed travel party are heirs you only count the days for them (so that would be 6). The others won't have their days counted against the restriction. Of course, if they return home early, you only spend the days they actually were there for ie leaving during first day - 1 day for each, leaving during second day - 2 days for each.
Why are you sending so many sims to Egypt, is there anyway you can cut down the number? I've previously encountered troubles when I've sent more than two on holidays, plus keeping them all occupied can be a pain at times.
Hope that helps, and I'm correct.