My plan is a fool.
I needed to catch time, well, I used the standard timer, which, by the way, never checked, because I was absolutely sure that with such a banality there can be no trouble... In general, I put time on the timer, started and, with a sense of duty, put the tablet aside. Two minutes later, the tablet turned off the screen and he, with the same sense of duty, forgot for me, just as I for him. Time passed, it passed, until (a few hours later) I suddenly realized that this passport was meant to signal, I pressed the power button, and here, please: "PI PI PI", bl*t, "PI PI PI PI".
Fortunately, I didn’t need a reminder, but hell, was there a timer at all?