It would normally take 8-12 months but there are a few 6 month accelarated courses, but I would like to remind you that medic school is a full-time job and unless you plan to work for 1+ year afterwards, your certification will be useless. You might as well work on your grades and mcat for medical school since it would take less time. If you have a few years to kill, that's another story, but even then I'd rather use my time more wisely since what you learn as a paramedic will be useless after two months in med school.