Certain controls have cut off times after which the marshalls will remove the SI boxes, effectively forcing you to retire. Not all controls have cut off times, there will be 1 or maybe 2 mid course cut-offs and one very close to the end.
Usually the cut off times are printed on the control description sheets, and are the same no matter what your start time. However start times are seeded so slower runners start first and get more time to beat the cut offs.





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