The recommendation here in Denmark is to air out for ~10 minutes, 3 times a day, ideally with all doors and windows open, making sure to get good airflow between rooms.
I think very few people actually air out that much, but I've found that it's very helpful for my sleep quality to air out just before I go to bed. Airing out in the morning also helps eliminate moisture from showering, as my bathroom doesn't have a window, nor any forced ventilation.
I also remember often getting really dizzy working in my previous office, and I couldn't understand why, maybe you're on to something.
Now I'm wondering how all of that has affected my health along the years