You can look at any account from a PC and see when they achieved 120 days add and you have their time at the game. This does not tell how active the player was. True achievement is in stats and other goals. Some achievements could be an indication of obsessive compulsive disorder. I knew a couple micro farmer who deliberately did not grow so they could farm and discourage new players. After a couple years these attention starved ppl quit and have achieved nothing. Some compromise their life style and grow in two years what some achieve in four. They should seek help With the cost of growing a fraction of it once was there is no legitimate way to measure growth/years. Maybe just take those testosterone the weight lifters are doing on another thread, and be done with it.
@dionise_murph Not everyone is on pc and the achievements could be scaled on a "days active equation" If someone is inactive for 2 months (approximately 60 days) then the days for the loyalty achievement could cease to continue counting. And no OCD