A really easy language, like ebonics, can be learned in one semester. (It's actually a dialect, not a language.) Esperanto can be learned in two semesters. To learn Greek well enough to be able to use the New Testament you would need two semesters and a computer Bible program, or else four semesters minimum and some good reference books. You would not expect to speak Greek, just to read and understand it, in four semesters.

letz learn greek together!

I agree with Henderson. In order to learn any language you need schedule and time. Greek language is not very easy since it's alphabet has a slight difference from the latin one. Preferably start with a teacher for at least two semesters and try to follow music and media broadcasts in greek; although the language in media is often very poor you will soon be able to feel familiar with it's sound.