Depending on how old the tarantula is and its sex (ie a MM wouldn't or a very old female) it should fully regenerate within one or two moults. Maybe even faster if its a juvenile.i am getting a C.Crawshayi(i know name change) in a trade that's missing one of it's back legs.how long do you think it will take it to regrow?and will it regrow enlarged like king baboons are know for?