I know this has been mentioned before, but I want to repeat it just in-case Kobo is watching…
An alarm feature (which you set) that’s let you know how long you have been reading a book. A flashing screen or pop-up dialogue etc.
We can get stuck in a book for hours and forget that we have to get up in the morning for work…. A clock on the screen is not the same as this would get ignored in a good book.