KissKissBankBank campaigns can last up to 60 days. You can set the duration you consider necessary to reach your goal and collect as much funds as possible.
A longer campaign does not necessarily raise more funds than a shorter one. The feeling of urgency can stimulate your community. Shorter campaigns are more dynamic and are therefore more likely to reach their goal.
There is often a peak of activity at the very beginning and the very end of the campaign. It is up to you to communicate actively around your campaign during these two crucial moments!