Architects have a minimum of a four-year degree (Bachelor degree) in architecture from an accredited university. Many continue their education and do post-graduate work in specialty fields.
You will probably need at least 4 years of school (a bachlors degree) - at the minimum. Many jobs these days require a masters degree (5-7 years total), though.
Architecture is a four year undergraduate course. OFr post graduation, architecture generally takes 2 years. This is often referred to as the '4+2' scheme.