The USCIS website hasn't updated their timelines for I-129F (Petition for an Alien Fiancé) in a WHILE.
I've seen lots of people gets I-129F approved within 11-12 months then with NVC speeding up and some embassies quicker than others, Andi is right in saying that having visa in hand within 14 months is possible.
But for the whole ceremonial wedding ? Yeah, don't do it.
your immigration journey will take twice as long if you do it because you'll likely be denied and have to file for spousal instead. Why risk waiting twice for one visa?