I know a delivery rider, in his fifties.

He said the hardest part isn't climbing stairs, but waiting.
Waiting for the restaurant to prepare the food, waiting for the customer to come downstairs, waiting for the elevator.
He said he calculated that the total waiting time in a day is enough to deliver twenty orders.
I asked, "So don't you rush them?"
He said, "Rushing doesn't help.
The restaurant says it'll be ready soon, the customer says it'll arrive soon, the elevator says it's already here.
Everyone's 'soon' isn't the same 'soon'."