depending on how quickly you pick things up I would give you a time frame of about 6 months for a 5-8 minutes short if you can get everything running smoothly. Otherwise i would say about a year to completion from start to finish. The best way to get it done is to make a production schedule once you feel confident enough in your abilities to get what you want made. Especially since this industry is all about getting stuff out on time to make the maximum amount of money. Good luck to you man and I look forward to seeing your work as you progress