Tracking time spent on specific tasks is vital if you're billing customers. However, billing doesn't have to be the primary goal. Simply tracking a job's progress can help you plan efficiently. For instance, knowing that a recurring task requires four hours helps you manage your own time. You might think that tracking just involves subtracting the time a task starts from the time it ends, but that's not always true. For instance, tasks that have the potential to extend into the next day (past midnight) need more help. Things get even more complicated when you sum elapsed time values to get grand totals. Fortunately, success is just a matter of applying the right expression. In this article, Susan gives you the tools you need to handle tasks that take two days or less.