In this case, the time tracking was done in a very fine-grained way; you'd log your working time against a given ticket or other thing. So if you got interrupte

In this case, the time tracking was done in a very fine-grained way; you'd log your working time against a given ticket or other thing. So if you got interrupted to go to a meeting or something, that time got logged to the meeting, not the ticket. Of course interruptions do incur a cost to context switch. But that probably won't explain how one bug fix that you thought would take an hour actually did, and another that you also thought would take an hour took five, especially if you did them both on the same day.