If you're looking at really making some gains on your navigational abilities, then a two day course is certainly the way to go. The second day really adds a lot of value in terms of consolidation of the skills learnt on the first day, and enables you to really take control under the guidance of an experienced tutor. As with all of our mountain skills courses the 2 day course can be tailored to suit your aspirations, so whether you're an absolute beginner or have a sturdy foundation already, you'll be sure to leave this course bulging with confidence. Each day will last approximately 5-6 hours depending on location and group size. 
As previously mentioned the course will be tailored to your requirements, but you could expect to cover everything listed in the above two courses.