The amount of time required for each procedure will depend on how extensive it is needed - whether just one surface needs treatment or multiple surfaces are involved, as well as how much decay is present. Generally speaking, most standard fillings take between 30 minutes and an hour, while an average root canal may require two separate visits; one visit for initial preparation work (one hour) and another visit for finalizing work (another hour). However, these times may vary significantly depending on your specific case, so consulting with your dentist is best for accurate timings.