Thanks for your answers.
To sum-up it is sensible to limit the g-onset to some limits to avoid sharp loss of conciousness, even if the time the pilot stays at a certain G level is a preponderant parameter of grey or black-out appearance.
From what was posted above, it also seems to me that when it comes to negative g's it is important to be able to release the G level quickly. Am I right? In other words no G loc can occure there and therefore we can (and should) give the pilot the ability to go to 1 g as quickly as possible.
Do I miss anything?
Thanks again for the help