Near the end of the parsha we see Moshe giving Aharon his instructions regarding the preparatory week before the dedication of the mishkan.
In 8:33 Moshe tells Aharon not to leave the Ohel Moed for the full 7 days.
Why can't he leave? What's the big deal if he wants to step out for some air or something?
This is a job that requires complete dedication and complete immersion. One has to give himself over completely and be completely dedicated to the job. The only way for that dedication to be pure and complete is by his total immersion into the job.
He cannot have any distractions. Nothing that might, even slightly, take away his focus and concentration from the mishkan.