On average, the tune-up of an air conditioner will take about an hour to complete. This means that there are no major problems with your system. The tuning of the oven can take between an hour and a half or two hours. But it depends above all on the age of your oven.
If they find you need more substantial repairs, it may take longer. However, if your oven is new and in a clean place, it could take less time. The weather is warm enough to run your cooling system worry-free, and you have plenty of options in terms of scheduling a service appointment with an expert HVAC technician. You should have your HVAC unit serviced to save on your energy bill and reduce the risk of carbon monoxide poisoning in gas heating units.