So, I just got "Fly the Coop"
Major props to LA48 and salfor1 for their help. Still, that's not the great news. The great news is that I WAS ABLE TO GET IT IN MULTIPLE SESSIONS! That's right; I did NOT do all three missions in a single sitting. Rather, it was spanned over several days with at most one mission completed under time per day -- NOOSE, Base II, then Breaker. If I quit, I just made sure my profile was updated within the server before attacking the next mission. Note that it always took over half an hour for this update take place on the server end.
Anyhow, I'm sure that there will be doubters and I'm sure that this won't work for some (the people with double accounts?). But all I know is that I was able to get this trophy without having to resort to leaving my PS3 on for an ungodly amount of time and pray that the connection did not drop, which incidentally it did many times. By the way, I'm not chastising anyone for resorting to these measures. I'm just overjoyed that I did not have to.
Now, it’s time to see if Petrovic and others work. Wish me luck
EDIT: It should be noted that the person that I was doing Fly the Coop with unlocked it at the same time and was doing it in multiple sessions. So, that’s at least two folks who have gotten it in multiple sessions.
Now for the really important update:
PETROVIC CAN BE DONE IN MULTIPLE SESSIONS
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The operative word in the above is “can”. There have been some unfortunate people for whom this trophy does not unlock in multiple sessions (see below). But it did work for me. I am in the process of helping two others get their Petrovic trophy. Obviously, they're doing it in multiple sessions. I will relay the results.
Again, this is purely conjecture, but I think making sure the servers updated before each new session is the best thing to do. I’m thinking that the system checks your online stats and compares them to the stats that you’re currently obtaining and if they add up to what’s needed then you unlock the trophy.
One last thing: Fuck yeah! I'm so glad this pain-in-the-ass trophy is finished. Now, I get to spend another 50+ hours in this game to rank up to level 10. Damn you Rockstar for your ridiculous trophies!!!
Edit 2: So, I just finished helping another get his last race for Petrovic and he got it as well!!!
Edit 3: I've helped another. This is now the third person (apart from me) to confirm getting Petrovic in multiple sessions.