You’re a better man than me Charlie Brown . . . lol
This is the reason it takes me 1.5 months to do 96 hours of grinding on my fastest attempt.
I much prefer just playing the game, and grinding is a bonus.
to put it lightly, its a torture simulator.
even with premium, grind times are pretty unbearable and they only get worse as you go higher.
without premium, probably just forget about top tier unless you want war thunder to be your real life 9 to 5 job.
its hard to estimate how many hours it would take to reach 12.7 without premium, but without any experience it would easily be many hundreds, somewhere around 1000 probably.
but that doesnt account for planes or helicopters, you can add a few thousand more hours if you want those without paying
edit: as LeChance said, its about the journey. if you only play to grind without enjoying all the tiers you will go through, its impossible to reach a high tier without paying for premium and premium tanks
Thats why I still only have one tree completed and over 3000hrs in game. I have done the journey and know what I like. I rarely change what I play and when I do I come back quickly because I just have more fun that way.
Without a premium account or a premium tank, I achieved ground top tier in the UK, Germany, and the USSR. I achieved ground BR in the US up to 7.7, but then I bought a premium account and did the other nations with a premium account and sometimes premium tanks. The Chinese tree is the only tree I’ve done with a high-tier premium tank - ZTZ96(P). I bought many premiums like the Somua SM, TURM III, Tiger II Sla.16, and T29 after I had grinded top tier in those nations. Oh, and I also grinded US aviation with the AV-8A. I achieved US helicopters with a premium account and the T29, but ZSRR helicopters I grinded with only premium account. Unfortunately, I can’t say how long it took me to get from zero to top tier in example UK. I know for sure that it took me five years to get to top tier in every ground nation. The last nation I got top tier was Italy.