At the moment, I know Turki, Farsi, Arabic, English, and Latin. For my professional life and my interests in science, I need to learn a few languages more. Among them are Greek, German, Russian, and French.
It usually takes one term to progress one step. The following is the time calculation for learning German based on the Gotte Institute information. Supposing that I want to cover A and B levels, it will take totally 18 months or 1.5 year: A1.1 (2 months), A1.2 (2 months), A2.1 (2 months), A2.2 (2 months), B1.1 (2 months), B1.2 (2 months), B2.1 (2 months), B2.2 (2 months), B2.3 (2 months).
If I complete these steps for all the four languages I need, 4*18=72 moths or 5 years. It is not a long time to spend on my future. Once I finish these languages, besides the English, Latin, Turki, Farsi, and Arabic, I will have access to almost all important documents from the west and east cultures to explore the history and evolution of human thought.