Model-Based Tester Extension Exam Structure
Similar to the Foundation Level Certification exam, the Model-Based Tester Certification exam will comprise of 40 multiple choice questions, with a pass mark of 65% to be completed within 60 minutes.
Accredited training providers
Exams may be taken as part of a course delivered by an Accredited Training Provider or taken independently at an examination center or in a public exam.
The typical duration of the Model-Based Tester Certification Training offered by an Accredited Training Provider is 3 days. Completion of an accredited training course is not a prerequisite for participating to the exam.
Please refer to the Web Sites of the ISTQB® Member Boards and ISTQB® Accredited Training Providers for exam and training availability.
Source: http://www.istqb.org/certification-path-root/model-based-tester-extension.html