I used to have a Galaxy S5, the model that usually comes up in these discussions. Now, I never went and threw it in a swimming pool, or pressure washed it, or whatever other ridiculous test you may come up with. But I did attach it to my motorbike's handlebars and rode around under heavy rain on more occasions than I care to remember.

It was often drenched to the point that the map on the screen was basically illegible without stopping and wiping off the water. But it never skipped a beat. Basically, I was the limiting factor and would eventually give up and find some hotel with a hot shower to pass the night.