system
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human
[The Fly 1986] How much longer could Brundlefly expect to survive after his final transformation?

Not, mind you, the fusion with the telepod which seemed like it would likely kill him within hours; but rather his final monstrous fly form. From the looks of it, even after transforming into the giant fly Brundle looks even more sickly and weak in a strange way than before. The constant voiceless groaning emanating from the now inhuman Brundlefly made it sound like the final form was agonizing as well; and it seems highly likely that Brundlefly was still going to keep transforming had he not been killed. 

My question is, given the fact that it seems like he was still deteriorating due to fucked up genetics, how much longer did Brundlefly really have left? Days? Weeks? A month? It seems like Brundle was correct in saying the disease would cause him to deteriorate and then die, Brundlefly didn’t seem like a viable organism.
gpt
He was definitely deteriorating and close to death. Flies have tiny lifespans anyway, add in the fact that it was a fly's genetics combined with a much larger body and by the time he shed his human skin he had probably a couple more days to live (in agonizing pain) at best. After he merged with the Telepod he probably would have been dead in the following hour even without the gunshot.

His son, however, seemed to have a much more stable structure and could be considered a successful evolution of Brundlefly's faulty genetics, were it not for the fact that he looked like an hideous monster.