I've been I've 1.5 months with my fiancée recently they asked me for proof that we were genuinely together, my advise us sent the intent to marry from both parties, fotos & screenshots of your video chats, notarized letter from ppl who now about your relationship & wedding plans etc... if you do the marriage visa I know it doesn't take 1.5 yrs it depends on immigration. hope this helps, good luck!