1

I'm afraid it's impossible to answer this question. Some people have a natural ability for languages and learn them very quickly, others might study for years and not be able to string a sentence together. Some people work their butts off and put significant effort into learning, others do the minimum and even in an emersion environment find foreigners to hang out with.

People here will probably tell you "When i studied Arabic i could ..... in a month" Well that's them, not you. Who knows, you might become be conversational in that time, you might not. the only way to know it to try.

2

Marhaba!
Learning Arabic is really hard. You have to decide if you want to learn standard Arabic (Fus'ha) or a dialect. I suggest Standard Arabic to be able to read signs and eventually some newspapers. The best is really to go to an Arabic country and immerse yourself in the culture. Different universities offer semester and summer programs from one to three monthes.
I was in Bethlehem but I DO NOT recommend this University, nobody was happy with the teaching and the director of the course is more business oriented then towards academics.
In Palestine, there is Bir Zeit University in Ramallah which has an excellent program (Ramallah is a modern lively city) or an Najja University in Naplouse (which is more conservative but were the people are quite welcoming towards foreign students).
With intensive learning at home and two monthes in an Arabic speaking country you should already acquire an A2 level that helps you to go along pretty well.
Go on! Yalla! You'll succeed if you work hard.
Kindly
Alfa