How long would it take me to learn guitar?

i want to play guitar. I am in a SCAPA program and i take muscianship theory so i know my chords, grand staff, triads, scales, and now we are composing the treble clef parts of two part inventions. Im learning by myself, and using musictheory.net guitar trainer since i cant afford a tutor, Im playing it for church so ear playing is m ybest bet. I already play a treble clef wind instrument. I generally catch on fast. How long do you think it would take for me to learn Guitar well enough to play songs during praise and worship