Allergic reations are "funny" things.  A person may use a product all of
their life and one day cannot use the product any longer due to an
allergic reaction.  In reference to the future beekeeper, it's hard to say
how many stings a week, month, or year are necessary to develop your
immune systems.  I would have tests done to observe how your body's
immune system would react to varying dosages of bee venom.  Immunity
is purely an individual thing. Good Luck!
                                            ML