Whatever the reason you have to learn English, you will never regret to have done it. English is one of the most widely language spoken around the world as well as the most taught. Many people learn English as their foreign or second language and it is the lingua franca of business.
If you learn English you will be able to get ahead professionally. Employers usually value their employees who handle many foreign languages. The following list shows the level of English language learning curve.
1 Spoken - 2 Months
2 Basic - 2 Months
3 Intermediate - 2 Months
4 Advances - 2 Months