There is no base duration. The spell stays active as long as the caster retains the mental capacity to be able to maintain it, which may be for hours or even days. It will drop if a group is disbanded.

Gretchen

Meeting Nilandia: http://www.gsguide.net/index.php?title=Nilandia
Nilandia's GS4 Info Repository: http://www.nilandia.com
AIM: Lady Nilandia

1213 Mind over Body also seems to have a infinite duration, as long as you remain in the group you maintain the benefit and the caster maintains the benefit until...?

I believe severe nerve damage may also cause a focus spell to fall.

Gretchen

Meeting Nilandia: http://www.gsguide.net/index.php?title=Nilandia
Nilandia's GS4 Info Repository: http://www.nilandia.com
AIM: Lady Nilandia