A lot of languages use "since", "from", and various tenses to express this idea. It sounds like a non-native speaker translating directly from his/her L1 into English (what L2, L3 learner can't sympathize?). As Steve mentions, for duration, use "for": I've been studying English for six years. *but* I've been studying English since 2007. From/Since the dawn of time, people have been questioning the meaning of existence.

in this case "for 6 years"