I just bought the battle pass, wondering if I made the right choice of buying it at tier 25. Is 40 days enough to unlock all the tiers? Having buyer's remorse because of this...

You're already buying a skin for 20 bucks or way more if it's a knife skin but you also need to have a different currency to actually use the full skin. And that currency is not really easily accessible: A small amount from the free battle...