Increasing the delay before an application is considered stalled

[Jerome Warnier <jwarnier@beeznest.net>]

I suppose most people know that sometimes, some applications take too
long to close, when told under GNOME.
I often have the case with Evolution.
On some slower machines, it always takes too long, and the user is often
asked if he wants to kill the application or wait longer.
I guess it's gnome-session which does that, but I don't see any way to
tell him to wait a little longer before asking.

Does anybody know where to look?

Thanks
-- 
Jerome Warnier <jwarnier@beeznest.net>
BeezNest s.a r.l.