One thing to watch out for when timing an enduro is how well the times are coming in. Quite often these races take place in areas that are very wide spread, and may not have the best cell reception. This can make it a challenge to be sure the times are being collected by Zone4
In addition, you rarely know when people are starting their runs. In some races, there is no set order so it can be a long time before you are sure all racers have done a certain Segment. Keep an eye on the courses so you know when a Segment is finished and you can tell the volunteers and officials to come in. If they can bring the timing equipment with them, that is even better!