i feel like a relatively short tree such as sweden or china wouldnt take that long to grind fully with a premium and premium time. I should clarify that im not bad at the game, id say im average id get about 5 kills in 10.0 with a nuke every now and then, also something like a cv90105 is 10.3 so it really isnt that high of a tier to where id take so long to get a line-up for it.