In terms of actual testing time under regular conditions, you will have 3 hours, 7 minutes to complete the four sections of the test, which comprise 79 questions and an essay:
Analytical Writing Assessment (AWA) - 30 minutes, 1 essay
Integrated Reasoning (IR) - 30 minutes, 12 questions (multiple-answer questions)
Quantitative (Q) - 62 minutes, 31 questions
Verbal (V) - 65 minutes, 36 questions
With optional breaks factored in, you may spend a little extra time at the testing center, closer to 3.5 hours altogether.