Quite a few - As toddler / youth a month + with polio, 4 days with a bad concussion from hockey --- As an adult a week in an infection control ICU for something I caught at work, 2 days with shoulder / knee operations, 4 days for a lump removed from my spine, 2 days for hand surgery, a couple of nights with ticker issues, 2 nights with Achilles tendon surgery --- overall I was looked after well and was glad to leave. Seen quite a few people in worse shape especially from polio.
With the Hospital post infection bugs floating around now they are good places to stay away from.
