It's not the time spent that is the only issue, but remembering to do this on a monthly basis, which if you offer something like polls or other types of features that are dependent on reseting the HITS in a timely monthly manner, then forgetting to do it even a few days into a month will pose a lot problems for users of that site.
Regards,
Eliot Lee
http://anthrotech.com/
Regards,
Eliot Lee
http://anthrotech.com/