I have earned a master's degree in Project management in Australia. The sentence structure of Mongolian is completely different than English. For example, when we say that I eat my breakfast every morning, in Mongolian we say I my breakfast every morning eat-in Mongolian. Now, if you just convert all the English words into Mongolian, then you will have a sentence to say. Like that, if you just found a way to speak. It is easy and fun actually. But the only hard thing that might be in my opinion is the pronunciation. But if you practice tongue twist a lot, just as learning another language. I am sure that wouldn’t be a problem at all.
Easy if you are just taught in easy way
It depends how much level you want. If you just want to talk daily conversation in Mongolian, i would say it will take 3 months