Webalizer can be a pretty CPU and disk intensive if you have many a web sites with a good number of hits, especially if you do extensive logging. You may have to do some test runs and look at the time and resources webalizer takes up.
If you want to run webalizer more than once, you will have to edit the crontab in
/var/spool/cron
I would not reccommend doing this though unless you really need stats updated more than once. If you must have more frequent updates using webalizer, monitor your site for slow times and run the jobs then.
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