For a brief period of time in the early 2010s, I lived in an apartment building that had a swimming pool. Since I worked from home, part of my daily routine would be a noon swim for precisely 30 minutes. I loved it.
These days I try and get in the pool at least twice a month, and I still swim laps for 30 minutes. Recently my wife upgraded her Garmin watch and I put on her old one. One of the features of this Garmin watch is the ability to measure your swims, something I could never do with the Strava app on my Google Pixel...