How can I remove the bar and how much time it takes. Can I remove it out side the usa,
Answer will be appreciated, thanks

Depends on what you did... if you overstayed less than 1 year, you will be barred for 3 years. If you overstayed more than 1 year, it will be 10 years. If you violated the laws on some issues, it may be for life. No expedition can be done. However, if you have family in US and they file a petition for immigrant visa for you, the bar may be waived but not easy... in case like this, get experienced immigration attorney.