I had the data logging cut out at around 125 minutes in race mode which is the highest/most data tracking. It could have been because of tree coverage blocking GPS. Not sure, but it never came back on that ride. Other times I have gotten over 245 minutes, but not sure if it was the same mode or not.
The 245min data log is around 80mb,
Race mode is 10ms / 100Hz
Track mode is 100ms / 10 Hz
Event mode is 500ms / 2Hz
Endurance mode is 1000ms / 1Hz
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