u/dr-sju-chi

I recently had an HVAC company come out to perform yearly maintenance on the 5 head mini split system in our home (we live in the US). The technician was only here for around 25 minutes; he left while I was in a virtual work meeting and he didn't let me know he was leaving. It seemed like a rather quick visit but when I got a hold of him he told me he had completed the work. I'm curious what others have experienced in terms of how long a typical maintenance visit lasts and what it entails? Thanks.