Good food for thought, Drogon Malice. I'll need to think it over a bit and go back and listen to a few specific places to see if I can line it all up.

Off the cuff, I think we have several anecdotal "instant turnings" in the story and a couple of listener witnessed "quick turnings" (meaning within, say, tens of seconds). I will say that some of the differences in things like turning time might be chalked up to dramatic effect more than science due to the audio medium. Since we have to hear the descriptions of the environment, it may take longer in listener time to get the story details about a quickly unfolding event. So, there might not be significance in the time it took Tommy to turn compared to Fernando solely based on the fact that Tommy's turn had a more dramatic impact on the story.

Anyway, there is obviously something up with Saul and we've been lead down the path that it has to do with medications after his GSW. Then, of course, we find that Tanya has something going on as well and since she and Saul are closely blood related, we are also lead down the path of a genetic factor.

Whatever the science behind it is, Tanya knows more than we do at this point, IMO, and will be key (I know, "thank you, Capt. Obvious").

Thanks for putting this theory out here!