Have you already checked the manual and the forum search?
This staff is already discussed and documented a lot:
www.google.at/search?q=limesruvey+timer&...8#q=limesurvey+timer
manual.limesurvey.org/QS:Time_limit/en
manual.limesurvey.org/QS:Time_limit_action
Or do you have already a concrete question?
This staff is already discussed and documented a lot:
www.google.at/search?q=limesruvey+timer&...8#q=limesurvey+timer
manual.limesurvey.org/QS:Time_limit/en
manual.limesurvey.org/QS:Time_limit_action
Or do you have already a concrete question?