Once you are familiar with the process you can winterize the rig in half an hour or less. Here's a few urls to threads in MOC on the topic of "winteriz" . If any questions after looking at these, post back and we'll try to help. On some of these threads, it doesn't start out looking like it has much info for you. Keep reading deeper into the thread.
http://www.forumco.com/montanaadmini...Terms=winteriz
http://www.forumco.com/montanaadmini...Terms=winteriz
http://www.forumco.com/montanaadmini...Terms=winteriz
http://www.forumco.com/montanaadmini...Terms=winteriz
http://www.forumco.com/montanaadmini...Terms=winteriz
That's just from the last 60 days, searching for "winteriz" in topics only during the past 60 days. You can probably modify that search and find more, if you want.
Hope this helps.