Hi again, Ruby - glad to see you have this thread & have added a SS that we goofy Americans can understand.

(We who live in the
only developed country in the world that
still does not use the metric system.

)
I'm not going to change it just because people tell me to do it. And of course a lot of people on the forums are experienced, even more than a vet (maybe) with diabetic cats but I will not change anything without a vet's opinion about it.
I will offer this up to you now, Ruby, and then I will let it go:
The manufacturer of ProZinc recommends twice a day dosing - not once a day. I'm sorry, but I think your vet is just telling you it's okay because either she doesn't realize that once every 24 hours is
not really an effective way to get a cat regulated OR she knows that some of her patients would prefer not to have to stick to a "once
every 12 hours" schedule. (We all know that it isn't exactly easy.)
No veterinarian is a "god" - and there are many,
many (including me) among our membership here at FDMB who can tell you we HAVE learned - sometimes in a very hard, even heartbreaking way - that veterinarians
can be mistaken in their beliefs about how to "effectively" treat feline diabetes. They are only human, after all - like
any of us - and they are capable of making just as many errors in judgment as any other human being,
regardless of education. (Sometimes ego get in the way, too,
especially where veterinarians or other doctors are concerned! We laypeople historically have tended to put them all on "pedestals." More's the pity.)
Of course, it is entirely up to you what you do: Whether or not you want to take one vet's word for it vs. reading through the drug manufacturer's recommendations for dosing (based on actual studies). And whether you want to take into serious consideration what the bulk of the experiences of ProZinc users here can inform: That if you desire to get your newly diagnosed cat well-regulated as quickly and effectively as possible, you'll understand the wisdom of twice-daily dosing. (You can always use a timed feeder to make sure your cat is eating - to help guard against hypoglycemia - if you cannot be around to test at certain times after a shot of insulin.)
Please know this: No one is really trying to bash you over the head about your choices; rather, we want you to realize that once-a-day dosing will just make it take
that much longer for you to get your kitty regulated. (I would assume that your goal is to have Baco 100% healthy as quickly as possible and in full remission, correct?)
On that note, I'll let it go about the dosing issue. I sincerely hope the best outcome for you and Baco - as I know everyone who has written on this thread does, too.

- Robin