If could be but it would all depend on how many trackpoints you have used. Once the maximum number of trackpoints are used up in the Current Track, the unit will delete the first trackpoint and place it at the end, than it will take the second trackpoint and place it at the end and so on...
Some ways around this would be to:
1. Once you have arrived at your destination, save your Current Track. That will allow the unit to start over with a new Current Track and you will have another 20,000 trackpoints to use.
2. Set the “Trackpoint Interval” and/or “Track Min Distance” to higher settings so that you use fewer trackpoints while moving. This may also keep the unit from using trackpoints while you are stationary or near stationary.