Test of English as a Foreign Language is a standardized test to measure the language ability of non-native speakers wishing to enroll in English-speaking universities. TOEFL is one of the two major English-language tests in the world, the other being the IELTS.

The four-hour test consists of four sections, each measuring one of the basic language skills (while some tasks require integrating multiple skills), and all tasks focus on language used in an academic, higher-education environment. Note-taking is allowed during the TOEFL iBT test. The test cannot be taken more than once every 12 days.

Duration: 8 weeks

For any further details, you may click on the following link
https://www.ets.org/s/toefl/pdf/toefl_ibt_bulletin_2015-16.pdf
FAQs
1) What is on the TOEFL test?
The TOEFL iBT® test is administered via the Internet, and the TOEFLPBT test is administered in a paper-based format. The TOEFL PBT test is being phased out. The TOEFL iBT test measures reading, listening, speaking and writing skills.

2) What is TOEFL IBT stand for?
The TOEFL iBT is internet-based and tests your listening, reading, speaking, and writing skills. It also tests your ability to combine more than one skill, such as listening and speaking, reading, listening, and then speaking, and reading, listening, and then writing.

3) How long does it take for toefl scores to come out?
MELAB - Score reports are sent to you and your designated school(s) about 4-6 weeks after the test. MSU Placement Testing - (proctored) Testing Staff will print a copy of your scores for you to take home. TOEFL - Scores are posted on the TOEFL iBT online registration system usually within 15 days after the test date.

4) How much is a TOEFL test?
The registration cost for the TOEFL iBT varies from country to country, and sometimes even from testing center to testing center. The test fee can be anywhere from 150-225 USD, but in most places it's between$160 and $180.