My sister became fluent in less than a year I'd say (living in Hungary, Hungarian boyfriend, worked hard at it and super-good at languages generally). I don't k

My sister became fluent in less than a year I'd say (living in Hungary, Hungarian boyfriend, worked hard at it and super-good at languages generally). I don't know what her accent is like but she definitely has no problem being understood by Hungarians - she has since lived in Budapest for a decade and came top of her year in her Masters degree in translation there which involved lots of translation into Hungarian (including things like poetry!). So possible if difficult!