I timed it, it came out to almost 4 minutes exactly. So CW would have been on the phone with the detective until at least 2:09 AM.
I'm trying to imagine the scenario: CW was talking to NK on his cell phone until 1:59 AM at least. At 2 AM, the detective calls CW's cell phone and CW doesn't answer. At 2:05 AM, CW calls the detective from his work phone and talks until at least 2:09, and during that call, CW calls NK on his cell phone at 2:06 for a minute (one minute into his phone call with the detective). NK listens in for 1 minute, (until 2:07) and then I'm guessing the call dropped because NK calls back immediately at 2:07 and CW answers his cell phone, yet he's still on his work phone with the detective (and does not mention to the detective that he's also been on the phone with NK for most of their call). CW talks with the detective for at least another 2 minutes. Then CW hangs up with the detective and continues his call with NK for another 9 minutes.
Is that right?