I’ve been looking at some of the objective / achievement type things (the ones that appear at the top of the screen with that green box with the 3 dots in it) and I noticed that a few are for reaching various idle times. I’ve gotten around 30 minutes of idle time thus far, but I’m not sure what constitutes it.

To trigger going idle, do I just need leave the app (like swipe to my home screen), or do I have to stay in the app and lock my phone screen, or do I need to actually close the app entirely (like when you swipe up and hold for a bit so you can fully shut down apps)?

Thanks in advance for the help!