For campaign types that have a timer (e.g. in a Chrono quiz or a Sudden Death), there are two values that calculate the time:
2- The 'server time' is the timer saved on our servers. It is the difference between the start and the end of the questionnaire or game. This value isn't falsifiable but isn't perfect either (e.g. latency between our server and the client). Someone who is playing from another continent will have an increased latency, which will make his time longer even if he was faster during the game.
Together, these values allow us to identify potential cheaters.
In the results table at the end of the participations, we always display the first one, so the browser time.
We decided not to allow time-based draw because
1- The first value is easily falsifiable.
2- The second value isn't communicated to the participant and isn't 100% consistent with the reality (potential latency, as explained above).
Which is why we strongly suggest you do not draw winners based on that criteria.