At Meijer's self-checkout yesterday.
DH, DD and I were behind an older gentleman (probably fifties), who was checking out a cart while (I assume) his father was bagging.
The SS part was this.
He'd pick up one item. Slowly turn it all around (I presume to find the barcode). Slowly scan it. Watch it go all the way down the belt. Look at the screen (slowly).
Slowly pick up another item. Slowly turn it all around (and all of the items in the cart were the same - some type of milk - all identical). Slowly scan it. Watch it go all the way down the belt. Slowly look at the screen.
I finally sent DH & DD out while I waited. I didn't have an option as the other registers were full by the time I could have moved.
When it came time to pay, the older man (OSS) slowly read the screen. Slowly pulled his wallet out. Pulled out one bill. Fed it. Read the screen. Pulled out another bill. Etc. It took him over 5 minutes to pay.
All in all, it too more than 15 minutes for an order of less than a dozen items. It must have taken them over 45 minutes to do their whole order, since they were mostly done by the time I got behind them.