That would be an interesting addition although impossible since I am always all over the place doing different things. I go through fits and spurts with it.
At times I will post comments and then flip to researching my next article.
So there is no rhyme or reason to it in the regards you are referring.
I can tell you it is a fair bit of time.
I flip flop too by placing reading articles in-between work and things of that nature. It would be an extreme pain just starting a timer and stopping it over and over while working and commenting.