You can request extensions with some limitations. You can make short extensions yourself here
. If you want a longer extension, please contact Support directly. In general, if all factors in your contest are balanced, you will likely not need an extension.
If you need to make extensions to the Open phase, Top 5 Phase, or the Judging phase please contact Support. Please be specific which phase you wish to extend and for how long. Also, please include the reason - this helps Support explain to designers why an extension is being provided.
Note: If you find you are not getting many designs please try to be patient and wait for your contest time to get close to the Open Phase expiration. I some contests, many designs will come later in the contest.