From the instructions for my new coffee grinder:

18. Grind in 5 second bursts, watch through the lid, stop when it looks about right.
19. Saying "one hundred and one, one hundred and two, one hundred and three, one hundred and four, one hundred and five" takes roughly 5 seconds.
20. This is best said in a firm, clear voice. Anyone watching will probably realise you're timing something. If you say it to yourself, they'll just see your lips moving and jump to conclusions. You could lose a lot of friends that way.