Hi Revi Your doc would be best at guessing how fast this tumor grows.I have heard it doubles in size every so many weeks,i forget the exact amount.It`s all just a guess.My guess is prob. 3-6 months.which may be generous.You could try calling Jean Wallace she specializes in brain tumors from a more natural perspective,at least you would still feel you are doing something.It`s a tough dec.to stop treatment or not.Your lucky your mom is involved in dec.my mom did not participate in any dec.i don`t know if she didn`t want to or couldn`t,i guess i will never know.Take care Susan