Becoming a Chemist takes around 4 to 6 years of college.
Some Chemists have a (M.S.) Masters Degree or doctoral degree (Ph.D.)
You can become a Chemist in as little as 4 years of college but if you want to become more experienced and be higher paid as a Chemist then you need to get the other degrees such as Masters Degree which takes the additional year or two to complete college for.
It's takes awhile to become a Chemist but if you can go to college for it becoming a Chemist is well worth it as they will always be in demand.