Armond Pelissetti received the police dispatch at approximately 9.58 pm and likely exited his police car at around 9.59 pm- at which point one of the Robbins kids, who spotted Zodiac in and around the taxicab that night- pointed out to Armond Pelissetti that Zodiac was approaching the intersection of Jackson and Cherry Street. This being the case, then Zodiac is at this intersection at 9.59 pm. Armond Pelissetti then ushered the children across the street to their residence. He then proceeded back to the taxicab and checked the status of Paul Stine, stating in the documentary he was 99% sure the taxicab driver was deceased. He then retook the description from the children and was now aware it was a white male adult, so "couldn't get to the radio fast enough" to inform the other officers of the amended description. He then likely set off up Cherry.
These were his exact words in the 2007 documentary:"it was then I was told it was a white male, I couldn't get to the radio fast enough at that point to let everybody else know. The kids had told me whoever had done this crime had left the cab, went out the door and seemed to be wiping the cab down and reaching into the cab and ambling or walking down Cherry Street in a northerly direction, kind of towards the Presidio. I walked that way myself, I did not run because there are innumerable alcoves and parked cars, so I went down following every technique I knew so I didn't get my head blown off."
Nobody knows for sure how long all these actions took, but a bare minimum of 2 minutes spent at the crime scene seems a reasonable estimate. This would have Armond Pelissetti beginning his journey north on Cherry Street at 10.01 pm.
Therefore, Armond Pelissetti left the crime scene at 10.01 pm and arrived back at approximately 10.08 pm. According to the widely held consensus and the storyline of the 2007 Zodiac documentary, Armond Pelissetti traveled up Cherry Street (which is a 1 minute journey at normal walking pace) extremely cautiously, checking the alcoves and parked cars "following every technique I knew so I didn't get my head blown off." He then supposedly bumped into Officer Donald Fouke (whether it was on his outbound or inbound journey is irrelevant on this occasion). He then presumably applied the same caution down Jackson Street (a 2 minute journey at normal walking pace), checking the alcoves and vehicles, before bumping into a man walking his dog on Maple Street. He had a brief conversation with the dog-walker, before heading back on the 3 minute journey to the crime scene, now presumably at normal walking speed. This whole sequence of events taking just 7 minutes.
The journey from the crime scene to the intersection of Jackson and Maple is approximately 3 minutes, a fact even confirmed by Zodiac: "2 cops pulled a goof abot 3 min after I left the cab." But if Armond Pelissetti was using every police technique he knew, checking the innumerable alcoves and parked vehicles, this journey must have taken at least 5 minutes. This would have placed Armond Pelissetti arriving to the dog-walker at about 10.06 pm. He then had just 2 minutes to talk to the dog-walker and arrive back at the crime scene at 10.08 pm, sometime before the ambulance arrived and eventually pronounced Paul Stine dead at 10.10 pm. We can throw in some leeway here and have Armond Pelissetti arriving back at 10.09 pm, giving him three minutes to converse with the man on Maple Street and return back to the intersection of Washington and Cherry. Nevertheless, it is an extremely rushed affair, considering Armond Pelissetti's outbound journey of 5 minutes or inbound journey of 3 minutes, also included talking to the dog-walker and Officer Donald Fouke.
But in all seriousness, this drives to the heart of the question posed by some- was the dog-walker somehow the killer? Without debating the legitimacy of suspects- if Kjell Qvale was the owner of Fido, then he had to depart the intersection of Jackson and Cherry Street at 9.59 pm (going on the sighting of the three teenagers with Pelissetti), and travel approximately 3 minutes to be firmly ensconced in his 3636 Jackson Street residence. He then needs about 1 minute to return to the area of Maple to be spotted by Armond Pelissetti. This allocation of 4 minutes shifts the time to 10.03 pm, leaving Kjell Qvale three minutes to enter his home, change clothes, put Fido on his leash and leave the residence. He would then arrive to the meeting with Armond Pelissetti at approximately 10.06 pm.
The timelines of Armond Pelissetti and Kjell Qvale are possible, albeit extremely rushed. However, this is nothing new for the Zodiac case.