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

[kh99]

There is no way to specify that through that interface. If you really have to have something run every 6 hours you could add 3 more scheduled tasks that run the same script and set the hour for each to something like 0, 6, 12, and 18. ETA:.. but if you have a forum without much traffic (like 6 hours at a time with no visitors) you might find it causes a problem when it tries to catch up.