ICAO Doc 9640
HOLDOVER TIME (HOT)
4.7 The HOT begins with the start of the de-icing/anti-icing application in the case of one-step operation, or the beginning of anti-icing in a two-step process and ends after an elapsed time equal to the appropriate HOT. A pilot must monitor the time elapsed from the start of the HOT identified and ensure that taxi and take-off are achieved before the HOT elapses. If not, additional de-icing/anti-icing will be required.
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