I cannot confirm or provide evidence. But I did read somewhere that for example 40-47 minutes equals to 90-75% training. From that moment I held this as a rule of thumb to manage my training minutes.
But as mentioned earlier; apparently I misread a bit and you guys were talking about the specific time frame 47:30->47:59(weekly stats show 48).
Then I cannot provide any ideas..:o
yesterday is history, tomorrow is a mystery, but today is a gift. That is why it is called the "present."