
Potentially a lot. Potentially much less than you're imagining. It depends on what “everything” means.
Lights do not teleport into position. Neither do cameras. Or microphones. Or furniture. Every location and major setup change costs time. That's why filming six videos in one setup may be easy, while filming six videos in six different locations absolutely isn't.
Interviews. Wardrobe changes. Hair and makeup. Talent arriving late. Someone suddenly realizing they forgot the product. Production involves humans. Humans are very creative with schedules.
If we're filming:
we can often capture a lot efficiently. That's where social content shoots work really well.
A commercial with:
may need most of the day for a relatively short final piece. That's normal.
It's:
Absolutely. But there is a point where “efficient” becomes “rushing through everything and hoping it's usable.” I'd rather plan the day well than brag about filming 40 things nobody wants to post.