its possible or not if i put 3000 for cookies settings

[geevest.com]

its possible or not if i put 3000 for cookies settings :

Session Timeout : 3000
is that can make the fatal mistake for the next?
what is the point plus and point less if i put that. thx

[snakes1100]

Sorry, but i really dont understand your question "fatal mistake for the next"?

The cookie session will determine how long a person shows as logged in on the site, it will also mark posts read if your using the cookie option for marked posts.

[geevest.com]

i mean,what if i set cookies with 3000 there will no any trouble for my site in the next future?
if this danger if i set up to 3000?

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sometimes i get a blank page after post its because i put cookies setting for 3000 or what?

[Dismounted]

As posted by Snakes:
The cookie session will determine how long a person shows as logged in on the site, it will also mark posts read if your using the cookie option for marked posts.