Capacity is the amount of time available to a resource. This can be measured in hours, days, weeks, or even months. Capacity is often used to determine how much work can be done in a given period. It is important to remember that capacity is not infinite and that there are always limits to what can be accomplished in a given timeframe. Try to use capacity planning to help you understand these limits and make sure you are realistic about what can be completed within a certain period.