Sadly the supermarkets like that have a scan speed.
In ASDA it is 26 and above, so that's 26 items per minute.
The ' good ' staff are above 35, I can achieve 30/31 on a very good day, on average I am 28.
Only around 8/10 staff achieve over 26, weekly. Their names are ' displayed ' on a whiteboard in order of speed, so I am usually in the bottom 3 :)
There must be what ? 25 staff over a 7 day period, with checkouts available for 12+ hours a day ( don't expect or hope for a checkout to be open just because the store is open ! This is an ASDA that is open from 6 am - midnight ! Checkouts are frequently closed from 7pm onwards. )
So 26 is not realistic, as a. only 33% of staff are achieving it b. 66% of staff never get there and the very top scanners must be scanning at 50 or so to even get the store average to 26 most weeks. Very often the store doesn't achieve it.
I understand both LIDL and ALDI have a much higher scan aim / achievement ?
M&S don't not have a target, they prefer a decent / good customer service, tho they do/did know what speed their staff were scanning at.