Following same journey as with Chinese heavy tanks (which took 13 days) by far the easiest & least stressful way to unlock brand new tech tree is not to play these vehicles at all but rather collect vehicle blueprint fragments from Daily Mission (I’d re-rolled missions unless its reward was bonds or blueprint fragment) rewards.
In these past days I was getting about 2 fragments per day and since there are 6 vehicles in brand new Japanese Tank Destroyer tech tree (Tier V to X) it took only 21 days.
necessary vehicle modules: 157000 Free XP
Daily Missions: 47 vehicle fragments (1 fragment: 1x; 2 fragments: 9x; 3 fragments: 8x; 5 fragments: 1x)
Tour of Duty: 3 vehicle fragments
Another advantage to this method is that it’s significantly cheaper than similar options…
‘Free XP only’ route would cost: 567320 + 157000 Free XP Universal/National blueprint research route would cost: 480 Universal blueprints + 162 Chinese blueprints (+ 157000 Free XP)
submitted by /u/_chubbypanda