Some large companies in non-English speaking countries will book courses for their employees to learn English fast, but for those without this opportunity there are still ways to learn English on your own, even while holding down a full time job.
Learning English can be a big career advantage to business professionals around the world. Yet many people give up on learning a new language when they get discouraged at the start. Having a positive attitude from the beginning is very important in sticking with any language course. It is good to pace yourself while learning, and visit bookstores to find books you like in English as a fun way to practice and improve your skills. Another option is to watch English TV dramas that you find entertaining, with subtitles at first and then with English subtitles. You can jot down words that are unfamiliar and then look them up in a dictionary after the show.