Fascinating.

  40 years at 0.90000c =   91.76 years
  40 years at 0.99000c =  283.55 years
  40 years at 0.99900c =  894.65 years
  40 years at 0.99990c = 2828.00 years
  40 years at 0.99999c = 8944.00 years

With the caveat that nobody will be traveling at 0.99999c for 40 years. You'd be really really far away by then.

Well, you'd still be less than 10,000 light-years away. That's still well within the galaxy.