Linux – cron job schedule

Ranges that wrap around like that are ambiguous. Specify the hours as 23,0-6 instead and avoid future problems.

Cron checks every minute the contents of crontab files and if it founds coincidence of the time and the conditions it will run the script indicated on the line.

For this case these is the set of coincidences that must be met:

• From 11 PM to 11:59 PM and from 0:00 to 6:59 AM
• From monday to friday

So, every minute during the time that the set of coincidences are true, it will run.

Don't expect it to run outside of the range of hours and days indicated, for example on saturday.

There is no crond.service on Arch Linux. As the Arch Wiki makes perfectly clear:

There are many cron implementations, but none of them are installed by default as the base system uses systemd/Timers instead.

Consequently, if you want to use cron, you have to choose which of the many implementations you will install, and then start that specific service.

You don't just randomly type systemctl enable nonexistent.service and then wonder why it isn't running...

If you want cronie, then you install cronie and start it with:

pacman -Syu cronie
systemctl enable --now cronie.service

The Arch documentation is generally very clear; if you read the pages you linked to more carefully, you should find out what you need.