Ordinarily, the 5-7 days that Chris is talking about it accurate, but that wouldn't apply in the situation where you've had a failed reduction. If you had reduced Doodle's dose (oh that is the darned cutest name to say!) because he'd gotten below 50 and had earned the reductions, then you would assume the previous dose was too high.
In your case, though, Doodle was getting good numbers on 1.75 and you reduced because he became ill and wasn't eating. It wasn't that his dose was too high. To me, that would just say to go back to the last good dose.
From the TR Protocol page:
If an attempted reduction fails, go right back up to the last good dose as soon as you see kitty's numbers trending upwards. You don't have to hold the reduced dose for a certain number of cycles before taking the dose right back up. The guidelines listed under the topic "Increasing the dose" do not apply to a failed reduction.
I do think Chris is correct in that you're not going to be able to see exactly what the dose will do until he's been back on insulin for 5ish days and the depot has rebuilt. It would have emptied in the days without insulin. But i think it would be wasting time with him in high numbers to delay on going back to his last good dose.
I'm a little concerned about your comments in his ss today, that he's hiding and sneezing. He may need a vet visit. That doesn't sound good, so if he isn't eating like normal, you still may be giving reduced doses if you are concerned about his appy.