I don't keep a count, but I'm sure I've checked thousands. They're extensively used in the types of buildings I inspect. Office buildings, (including every server room ever) retail, restaurants, old buildings with multiple additions and historic buildings that ducted installations would cause irreversible damage. I also have a friend who owns a top HVAC firm for almost 40 years that was one of the first to import ductless systems. The estimated 20 year lifespan is conservative. Some have made it to near 30. These were all manufactured in Japan. Now there's been a change. Over the last 4 or 5 years, the systems have all been manufactured in Korea or Taiwan (even Mitsubishi). There is no way to decipher the age from the serial numbers on these recent systems. I also don't yet know the life expectancy of the new heat pump systems with inverters.
source https://www.inspectorsjournal.com/topic/18786-15-year-old-mini-split-systems-if-replacing-the-cu-what-about-the-indoor-unit/?do=findComment&comment=171968
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