Why is it sometimes the outdoors seems too bright and your eyes take a long time to adjust?
Sunlight is much brighter than even “bright” indoor light. You probably know this, but don’t realize the matter of degree. The illuminance outdoors on a sunny day can easily be thousands of times greater than indoors. Our eyes adjust immensely for this
Your pupiles, the “hole” in your eyes, get bigger for more light to enter (so you can see better in the dark) and it gets smaller to catch less light when is not necesary, like the example you’re describing. It shouldn’t take that long though, usally takes longer if you pass from a really dark room to outdoor sunlight, because the change is bigger. It also can take more time if you’re eyes are already tired.