I'm not sure if this is the correct area to ask this.
I have this crontab job */10 8-17 * * 1-5 fetchmail mailserver.
Now, the book says that in this example, every 10 minutes (*/10) between 8:00AM and 5:50PM (8-17), from Monday to Friday (1-5) the fetchmail command is run to fetch incoming emails.
My question is, why 5:50PM specifically?
Where in the crontab job would I be able to determine such times, anything other than 1 O'clock or 2 O'clock, etc...