I hope this introductory presentation to ITIL v3 Foundation exam will be very useful to the readers. The time one needs to spend on study depends upon one's experience with ITIL related practices in real world. Nonetheless, it is very simple study, but the exam questions may be trickier than expectation. So, focus on learning ITIL concepts rather than adding ITIL certificate to your resume.
References for the slides used from:
The Art of Service – ITIL v3 Foundation Complete Certification Kit (book and online course)
Skillport - IT Infrastructure Library (ITIL) v3 Foundation Syllabus v4.2 exam