www.redtailboas.com is an excellent website to check out that will answer your questions.
I believe its 2-3 years for them to become pretty large, I have a baby he is 4 months old and about 30" 115g male I handle him just about every day, extremely docile and inquisitive, much more active then a BP I have him in 40 qt tub and will keep him there till he is about 4 feet or so then move him to a 4x2 enclosure which should be good for him pretty much forever.
here is a picture of my little guy.
Chad








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