I cleared this up with Myers a few days ago. It was much closer to ninety seconds.
Thanks for clearing that up. It makes no major difference to the time line, but it does establish that Bowley must have arrived at the Tippit scene roughly 2 minutes after the shooting (Benavides waited 40 seconds for the killer to leave and then took 90 seconds working the mic, before Bowley took it over.
Now, here's the obvious problem. Dale Myers has estimated that Tippit was shot at 1:14:30. Add 2 minutes and 10 seconds to that for Bowley to start making his call and you get 1:16:40, yet the DPD transcript has Bowley making his call after the 1:17 time stamp.
And then there is Callaway. He got to the scene within 3 minutes after the shooting. Bowley finished his radio call after 46 seconds, which means at around 1:17:26. Callaway must have arrived after that, because he did not know if anybody had called it in. The DPD transcripts have Callaway making his call at around 1:19 or even (closer to) 1:20. Two minutes is a long time, if you are just standing around. Are we really to believe that Callaway just stood there for 2 minutes or more before he decided to get on the radio?