4. Except for the two inconsequential calls 3 and 5, the approximate timings were between 1:42 and 2:07 minutes, must less time than with the call with Nofke.
Three different things went into making that call so long.
The first was Martin approaching Zimmerman. That resulted in Zimmerman updating his description of Martin. Btw, I think this part of the NEN call casts doubt on the very beginning of Zimmerman's story, when he passed Martin closely before stopping to call. It sure sounds to me like Zimmerman getting a close look at Martin for the first time.
The second thing prolonging the call was Zimmerman forgetting the name of TTL. That resulted in Zimmerman giving lengthy directions, correcting himself a few times, and in he and Sean going back and forth with Zimmerman's home address and the canceled mailbox meeting.
The third thing was Martin running. Zimmerman didn't say much during the 'wind noise' period, just the whispered curse, 'Yeah', 'OK', 'George', and 'He ran'. Besides prolonging the call directly, this episode interrupted Zimmerman's directions, so he had to start them over again.
Martin approaching and passing the truck took about 40 seconds. Zimmerman's aborted directions took about 20 seconds, compared with about 10 seconds for 'Altermese Bentley'. Then Zimmerman reported Martin running, and it was another 20 seconds before the call returned to routine by Sean asking Zimmerman's name. The second directions period was about 20 seconds again. Then the address and mailbox exchange was about 30 seconds.
That adds up to about two minutes. Subtract that, and the time is in the ballpark with the earlier calls.