How to set Cron jobs (Scheduled Tasks) from each 1 hour to each 6 hours?

[MyLibary]

Try to figure out how to solve this stupid problem.

Right now the "thread views" cron job is doing it every hour, i tried anyway to set it to every 6 hours but failed.

Any suggestions?

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Here i have attached screenshot:





As you can see i have set it up to hour "6".
I expect to get the script update every 6 hours but it set it up to get updated at 6AM morning every day.

Waiting for your help.