I am new to writing some scripts. I have this function right here, that i created. It always comes with an interval of 2 hours. Everytime, that the trigger was used, it gets disabled. I have to delete them and start them again. Is there a way to re-enable the scripts, or to delete and recreate them daily?

They always have to come at the certain time.

I used the script below:

function setTriggerNL() {
  var startTime = new Date();
  startTime.setHours(7); //Allows to set a preferable time to start
  startTime.setMinutes(45);
  startTime.setSeconds(0);

  var endTime = new Date();
  endTime.setHours(23); //Allows to set a preferable time to end
  endTime.setMinutes(45);
  endTime.setSeconds(0);

  var intervalMinutes = 120; //Works with a 120 Minutes interval 

  var currentTime = new Date();
  var nextRunTime = new Date();
  nextRunTime.setTime(Math.ceil(currentTime.getTime() / (intervalMinutes * 60 * 1000)) * (intervalMinutes * 60 * 1000));

  if (nextRunTime < startTime) {
    nextRunTime = startTime;
  }

  while (nextRunTime <= endTime) {
    ScriptApp.newTrigger('NewsletterHTML')
      .timeBased()
      .at(nextRunTime)
      .create();

    nextRunTime.setTime(nextRunTime.getTime() + (intervalMinutes * 60 * 1000));
  }
}