I keep ranting on cohost dot org about how good D-Genesis is, maybe this will be the quote that really gets some of you nerds interested? In volume 3 there’s a footnote explaining what NTP is, as it’s an important plot point and overlaps with a few facts we learn about the world.
I love it when an author comes up with rules for their world and then really thinks though the consequences - Time works weirdly for things stored in storage skills, and communication with the outside world is impossible in dungeon spaces. So yeah, you gotta keep your phone in your pocket bud.

Sleepy-girl representation is important