Big Red Truck

So I'm in the elevator the other day talking to a lady about having to wait for them. I'm going up to the 6th floor from the 2nd floor. She's only going up to the 4th floor. Anyway she made this comment to me that after her class (on the 4th floor now) she has to wait sometimes 15 minutes for an elevator to go back down to the 2nd floor.
Now I know I'm not always the sharpest crayon in the box but ummm doesn't it seem to make more sense to just take the stairs? I mean you're not exherting that much energy to walk down stairs and who wants to stand in front of an elelvator for 15 minutes waiting for it to open?