Not sure what you mean. D2 is considered a "strength" day, so you'll time how long it takes you to do each round and then add them up at the end. You don't include the rest times between rounds in the total time, which is why you'll see some people post their time for each round instead of the total work time.
For D2 you should take as much rest between rounds as required to finish your next, but try to keep it to a minimum. 3 minutes should be a maximum as anything more than that won't help.
Hope that answered your question.