How can I limit how often users vote on my poll?

Right now it seems to be 24 hours in between when u vote and when u can vote again. How can i change it to be a longer time?

Can you not change it from your admin page (admin/admin_settings.php) I have it set to 720 hours which would be a month. I supose you could just add what hours you like, I'm not sure if there is a limit that it can go to.

[quote="terreus"]
Can you not change it from your admin page (admin/admin_settings.php) I have it set to 720 hours which would be a month. [/quote]
Ok, but which option should be changed on admin pages:
(a) locking timeout
or
(b) Server time offset?

Use 'locking timeout' as the 'Server time offset' is normally used only if your server (that the site is hosted on) is in a different time zone to where you are located.

Thank you for your quick answer ;-)
Another question:
I have checked "Check IP table" AND "locking timeout" - what does this configuration means?
(a) users having the same (common) number IP CAN vote on the same poll only if they (thier browsers) have NO cookie ("this guy has already voted on THIS poll")?
(b) users having the same (common) number IP cannot vote no matter what say thier cookie.
Can you tell me?