The course must be taken at your own pace most importantly. Everyone learns in their own unique way and will find different elements easier or more challenging. I recommend taking at least a week between each lesson to yourself time to absorb the information and techniques.
Yes, but only after the subsequent lesson has been unlocked.
The viewing time lasts between 20 mins and half an hour but it’s recommended you spend at least an hour going through the information contained therein. Paul’s 1 to 1 lessons last an hour and hence the online lesson should be treated in the same way.
Yes, it’s imperative you watch them in order as they follow a very specific learning progression, not only in terms of the physicality of playing but also in terms of the musical theory information included also. If absorbed in this way you will definitely reach the ability level required to complete the course, and thus be ready to move on to the next stage of your playing.