Basic knowledge of the file access requirements involved. Fifteen to thirty minutes a week Knowledge of the program's setup and file structure necessary to spot check the program directories. On the high end, you might need to use backup software such as Retrospect. Twenty to thirty minutes generally, but can be much longer, depending upon the situation. The amount of time it will take to make changes and corrections at your site will depend upon the situation you encounter.
Most basic calls take fifteen to thirty minutes to complete.
More complicated calls may take an hour or two of the Administrator's time, and may be spread over more than one day.