Regarding timeout ?/

Question

Hi

Well just swipe the dust in my mind ..

Say i have a big form with different controls .. The page session timeout is set to 5 min ... well i am filling the form it took more than 5 min of time now what will happen to the data i filled to that point ... 

1) Do i need to fill again ? 

2) what is session timeout of this forum ! Any ideas ? well does session timeout related to page idle ? or it will occur whatever you do after session timeout exceeds ?! So we need to provide the credentials again to create a new session ... 

3)I dare to say cookies also expire ? an i right ... but say when i store this forums password saying REMEMBER ME .. How long it will be in my local system memory .

Thank you
I hope you share your opinions not any links of what is what .. 

Regards