We have ACARS in our RJs. So the out and in times are automatically recorded. The ACARS then gives you a total block number when you pull in to the gate and open the door. My question is this- when converting the time over to decimal format, should you round up or down? Example, if the total block time was 45 minutes... when entering that into my log book, I would divide 45 / 60 to get 0.75. Should I enter 0.7 or 0.8? Up until this point I have been rounding down. But I realized that I am cheating myself out of time.