Translations:Participant settings/8/en
From LimeSurvey Manual
Set token length to
Usually, the default value of 15 (max. supported value: 35) digits does not need to be changed. However, if you wish to change this setting, please enter a number (X) which is greater than 5. If the number entered is smaller than 5, it will be converted to the default value of 15. When generating tokens, all tokens will use a length of X digits.