Great question!
My courses range from 3 to 6 hours and are delivered in short, digestible lessons which makes it easy to refer back to important topics.
I recommend taking the course over 4 weeks and giving yourself 2 hours a week to watch the lessons, complete the practical exercises and take the quizzes. However, I've also had students complete the course faster (and slower) based on their needs and schedule.
My courses are also based on quality (not quantity), so I always focus on giving you the knowledge and skills you need as clearly and concisely as possible.