Just run them periodically when you get a free minute every few days or weeks. You can't really hurt anything by running the tasks more frequently than is intended, and they don't need to be run on a strict schedule. If for some reason you feel the need, you may print the output of the system maintenance tasks (but why?.). The output of the task is displayed in the scrolling view in the bottom part of the window. After that, it typically takes less than a minute for each task.
Also, if your log files have grown extremely large and you are low on disk space, the tasks may have problems moving the files around and compressing them. If you've been leaving your machine off at night without allowing the maintenance tasks to run for several weeks or more, the first time you run them using MacJanitor may take several minutes. Laptop users could click the 'daily' button every morning (or every few days), or office workers could click the 'weekly' button on Mondays. MacJanitor provides a way to run these system tasks at the click of a button.
If these maintenance tasks are never run (such as on a laptop that is always shut off at night), many log files and system database will grow extremely large or fail to get backed up. In addition, there are scripts designed to run weekly on weekends, and once a month in the middle of the night. Mac OS X inherits this assumption in version 1.x, and has many system maintenance tasks that are scheduled to run between 3 am and 5 am. The Unix subsystems on Mac OS X were originally written for machines that were typically never shut off. MacJanitor is provided as freeware as a service to laptop and energy-conscious home users. MacJanitor is designed to be used on a periodic basis by Mac OS X users who don't leave their computer on (and awake) 24 hours a day.
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