A furnace tune-up/repair on average can take anywhere between an hour and a half to two hours depending on the amount of repair work that is required. Although, it mainly depends on the age of your furnace and several other factors. For instance, if your furnace needs more substantial repairs due to the age of your system, it may take more time to complete the necessary repairs. However, if your furnace is newly installed, kept in a clean location within the home, and well maintained, it could take even less time than on average. Every job is different some take less time than estimated and some even take more, for better time and cost estimates contact Tropic Air Toronto HVAC experts.