From what I have been told by numerous people is to not discharge NIMH cells below .09v. I have heard that batteries that have been stored for a long time can be dead shorted (taking down to .00v) to help wake them back up but I wouldn't recommend it.
I have always taken my cells down to 0.9v and they are going strong for over a year now.
Losi XXX-T / Novak GTB-10.5SS
Losi XXX-CR / Novak GTB-8.5SS
Losi XXX-NT To pretty to run.