1) There are no clocks on the phones or in the city, and characters who arrived with watches will likely find that the day cycle does not match up with what their watch is saying. Attempts to create a universal time that is applicable to Hadriel would be interesting, however!

2) Yes, the days are now 24 hours! We're in the process of updating some of the game info, and that's one of the things that will be updated.

3) A sundial wouldn't work, unfortunately, since the light in the cave doesn't actually move - it only dims and brightens at appropriate times.

Thank you for the questions!