wear is increased at engine start
When you have no oil pressure and you start the car, that is when the most wear occurs on your bearings.
Crank bearings in most cars are not roller bearings anymore. They are called plain bearings and rely on hydro-dynamic lubrication.
Here is answer related to crank bearings with illustrations so you can understand how these bearing function and how they can suffer from increased wear at engine start.
These fluid bearings are also called 'fluid dynamic bearings' and 'hydrostatic bearings'
They rely upon a thin layer of oil between the crankshaft journal and the hydrostatic bearing. The crankshaft rides on the oil much as a pane of glass would sit on a layer of water if you poured it on your countertop and sat the glass down on it. Breaking this fluid barrier wears the bearing surface down. Once the bearing is worn down too much the integrity of the fluid barrier can get broken due to too much gap between the journal and the bearing. When that occurs then engine will begin to eat itself up. A condition called rod knock will begin to occur.
This answer describes 'rod knock' very well.
Although saving fuel is important to our wallets as well as the environment you want to be careful with stopping and starting your engine all the time. Certainly technology has become better and vehicles are less prone to this issue than any other time but there is a balance to doing this too frequently.
I don't think your describing a constant start/stop of the engine like a delivery truck but this is something to keep in mind. I typically leave my engine idling in situations like that.