How many years does a ophiologist have to go college for degree?

There isn't a specific degree called "Ophiologist." Herpetology is the field of study that includes snakes (ophidia). To become a herpetologist usually requires a minimum of a four-year bachelor's degree in biology, zoology, or a related field. However, many herpetologists pursue advanced degrees like a master's or PhD to conduct research or specialize in a particular area.