The question is, if Peppy implemented some methods to gather statistics like this, even if they are invisible for players.
If he already did, this could make things much easier, but he could also not to, which could probably make impossible to tell: how long the current players already played, up to now?
It would be a nice statistic to have, but if it was to be true from some fixed date, like: 1-st February 2016, this should be clearly stated.
We must to take into consideration, that if we were to start counting the time from now, then overall time ranking would be false, especially for at least few years
Still, even knowing how much I played this week / month / year would be great, so I am definitely supporting this idea!
but no stars this time, I am too poor in them for now:(