I have questions now..

Your question made me delve in a little bit to the screentime stats and something is off because, for example, today I have not spent anywhere near this much time on either messages or signal, so now I am questioning all the data in there.

Also, what does screen time mean? 
How is it measured?
Does it track your eyes and when you are looking at the screen?

As I scroll through the times it is showing me, most of them do not seem accurate at all  🤔 https://i.nostr.build/G5yFKjgZt0ZtL5PS.jpg  

 My guess is that the stats are accurate and you underestimate how much time you spend in these apps. 

That's at least how it was for me when I started looking.  

 I know I spend more time than I think, as many times I’ve looked up from my phone and been shocked at the time.

That said, I def hadn’t spent close to an hour on Signal this morning when it showed that.

Also still wondering how it measures time spent.. is it tracking our eyeballs on the screen, or do you have any idea? 

 I assume whatever app is foregrounded is counted as active use if the screen is unlocked, so if your habit includes writing someone back and putting your phone on the counter unlocked it will probably count (until your device auto-locks). That might explain some extra time.  

 There is no eye tracking or anything of that sort btw, and if you want to learn about how some of this stuff works this might be an entry point: https://stackoverflow.com/a/8516056 

 Thanks for this. I’m on iPhone, will check if it still applies 

 Ohhh yes, that explains it! I have it set to never auto-lock for some reason, so thank goodness, I knew I didn’t spend as much time as it was showing 😂😅

Gonna change that now and see what the damages are the next few days.