Attentiveness test: The entertaining table for observation check

There is a table for observation check. Its name "Entertaining Table".
It is in order to find the numbers from 1 to 90. If you do it for:
5-10 minutes, then you have an exceptional observation.
10-15 minutes - good.
15-20 minutes - the average.
20-25 min - satisfactory, but an amazing patience.