Yeah, too many variables to nail it down for an individual snake. Also, their metabolism will adjust to their food availability.
I'm interested too. How did you "accidently" get a boa?
Or did you mean you hadn't planned on it? Because if that's the case it's kinda like somebody havin' sex. "Oh man, this is cool" and then it's "wah-waaaaaah" and the next thing you know it's a lifetime of responsibility. Or at least in this case with the snake a 20 year (more-or-less) commitment to an animal that will outlast any dog or cat if cared for properly. Good luck with the boa! Colombian?