One time I did have a report questioned by an MSC. I was doing a route of back-to-back shops, and I was concentrating more on the details of each than the timing. I was alternating between looking at the clock in my vehicle, my watch, and my cell phone. Well, needless to say, the timings got fouled up and it looked as though two of my shops for the same company overlapped.
So your tip for the day is: Be consistent with whatever timing device you use, and only use that specific one for the day.
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"Between stimulus and response, there is a space.
In that space is our power to choose our response.
In our response lies our growth and our freedom."
~Viktor Frankl