That's not the situation most players that are active are in tho. Rather do the maths with x3 and 1450xp per minute (on x1), so that would be a bit faster.
4350xp/min -> that would be 3843 hours. Sounds a lot but its easily done in a year (if 10hours a day ;) ), tho for the continous x3 you got to plan a good amount of x5 because with every new start you get x1 only and you often lose a round as well if map changes for exmaple. And for this maths you need to be gen 16+ of course. ^^
But two years do indeed sound rather real.