the conventional phrases are easy to learn - however the grammar it-self is quite tricky but not impossible
but then there is and aristocrat Russian and "old" - poetry Russian - that are totally different "beasts"
to learn the essential spoken language likely goes quick
then , at least 2y (and this is likely quite intense learning) to get the grammar
+ more if you want the insight to the mentioned two "beasts"
/// i can moslty understand spoken language and understand quite well the technical Russian . . . but my grammar is becoming rusty as i don't write anything in Russian in these days anymore
but then there is and aristocrat Russian and "old" - poetry Russian - that are totally different "beasts"
to learn the essential spoken language likely goes quick
then , at least 2y (and this is likely quite intense learning) to get the grammar
+ more if you want the insight to the mentioned two "beasts"
/// i can moslty understand spoken language and understand quite well the technical Russian . . . but my grammar is becoming rusty as i don't write anything in Russian in these days anymore