[krapp]

>Why do hourly employees care how long your lunch break is

Because you have a ten hour shift of difficult labor and twenty minutes of your thirty minute break is taken up with walking. And if you're in a FC with robots the time it takes for the Kivas to arrive at your station counts against you because you're expected to start working thirty minutes after your break starts, so on top of everything else you have to end your break early to make that time up.

>I don't see why they'd care if it's 30m or 2hr, since people could just make up the hours by working later.

I'm not aware of any business that allows its employees to take arbitrarily long breaks or to work arbitrary extra hours to "make it up." If such a company exists, Amazon is definitely not one of them.