Maximum length for optical toslink

Hi all,
I have moved to PC based digital and currently have my PC about 20' away from my DAC, with a 25' optical cable between this a no-no? Is there any reason to believe that my sound quality will suffer as a result? I am considering moving to a Duet...but not for a while.
Also, I do not really have the space to move my computer closer...
thanks for your suggestions.
How does it sound?
It shouldn't be a problem, see:

for more information.
25' is nothing for a optical signal. There should be no negative effect on the sound.
good stuff.. yeah, it sounds okay to me :)