the person must don't have real life works, lot free time, hardcore, got the highest skill aimbot, spend moneh, in at least 2/3 days or one week reach tier 10 ship.

for me I still stuck at tier 4 ship

It took me 2* months since I'm working adult.
I willl give u rough estimate on a normal account. T9 Baltimore to Des Moines 237k + 40k hull = 280k exp. I achieved tat by having free exp researching the hull and the rest are the ship research itself.

280k + another 15k for range upgrade . With exp ranging from 1k to 2.5k depends on how u play for each 20mins round.

Per day grinding with premium can easily get me 50k + - depends on how determined I am to lose credit since each round repair cost will probably minus ur existing credit.

I normally switch in and out between my cleveland and Baltimore to earn credit if either one is on battle.

And now I'm struggling to retrain my commander up bcoz having no skill in T10 battle is hard.