The log book must cover a continuous period of at least 12 weeks throughout which you
car. If you hold the car for less than 12 weeks, the period must be the entire period for which you held the car.
The period may overlap the start or end of the income year, so long as it includes part of the year.
If you want to use the ``log book'' method for 2 or more
cars for the same income year, the log books for those cars must cover periods that are concurrent.