One common question from people who are new to Max-OT training is about the short duration of the workouts. A lot of times people have been brainwashed into thinking long workouts equal better workouts and that is not the case when it comes to maximizing your gains. You want low volume/high intensity workouts focused on one or two muscle groups. You don't want to be in the gym for hours. In fact, if your workouts are taking you more than an hour to complete you may want to re-examine your approach.
Max-OT workouts will range anywhere from approximately 20 minutes to 45 minutes depending upon the body part arrangements. Don't be fooled by the short time span because short doesn't mean less intense. I'd argue it is just the opposite. Shorter workouts allow for greater intensity and focus compared to marathon workouts that span an hour or more. The longer you are in the gym and the more sets you have piled up the more likely your intensity and focus will decline over the span of your long duration workout.
Remember, the goal of each Max-OT workout should be to effectively overload the targetted muscle group(s) and the duration of a workout has nothing to do with the overload success achieved.