Previously there were two formats of TOEFL examination namely Computer Based Test (CBT) and Paper Based Test (PBT). Although PBT still exists in some parts of the world, CBT was totally replaced by the format Internet-Based Test (iBT) around the year 2006. The duration of the TOEFL iBT is 4 hours and it is divided into four subcategories:
(1). Reading (60-100 minutes)
(2). Listening (60 –90 minutes)
(3). Speaking (20 minutes)
(4). Writing (50 minutes)
The test scores are valid and can be used for two years from the date on which it is taken. The test dates, registration and the nearest TOEFL centre can be found from the ETS official website and the test is conducted around 50 times per year.