I have lived, studied and worked in Sydney, Australia for 40 years. Originally I'm from Jakarta, Indonesia and now living in this great city again, but recently moved to Bali. I can teach both English and Indonesian for improving your conversation or on a high level for work or business purposes. My academic qualifications are BSc (Computer Science), UNSW, Sydney, and MBA degree, SCU, Lismore, NSW, Australia.
My teaching style is casual, flexible, but comprehensive, covering all grammatical rules whenever necessary to build the strong foundation, prepared to fit totally based on the student's needs and situations.
The issue is how often can one practise English on daily basis in a non-English bubble. Practice makes perfect as they say. This is where I come in, acting as a sparring partner, tutor and teacher, providing the Western perspectives and cultures along the way.
3 months, 6 months, up to a year perhaps depending on one's intensity and capacity for learning.
If the current tutor is not available, check the availability of other tutors.