Solved - made a program myself.
Quite a common sense, but sometimes gaming gets so addictive that I start ignoring clocks, watches, alarms and even physiological needs like sleep and food. What works for me is, when someone else tells me how long I've been playing. So that's why I asked for it.
Because there is no such program, I decided to write one myself. I'm not a programmer, but can "think like one". So I went by the way of "scripting" rather than "programming" and here is the result: