My goal is to keep it under 7.8 at all times. I don't freak out if it goes over, but I do adjust and omit that food or cut it down.
The official advice is under 10 by 2 hours - my view of the official advice is that it is dangerous paternalistic pessimism: You're not going to be willing to do what it takes to achieve normal blood anyway, so we'll set standards that we can drug you into reaching in most cases. That results of those recommendations are clear from the state of far too many late stage T2 diabetics: neuropathy, lost limbs, lost organs, and heart attacks. I'm not interested in any of those.
Where the dividing line is between dangerous (which I truly believe the current recommendations are) and safe (normal is clearly safe - but how much higher than normal is safe) - you'll have to make your own decision.
Part of my goal setting is influenced by two recent studies: The first showed a significant increase in chronic kidney disease in prediabetes patients - the first study that specifically linked mildly chronically elevated blood glucose levels to kidney disease. The second was published electronically in December, but its formal publication date is about 10 days from now. That one demonstrates a link between higher, but still normal, A1c values and all cancers except for liver cancer. The study was a long-term prospective study (14 years). (Liver cancer, oddly enough, was inversely linked to low A1c values.)
These come on top of prior research that demonstrated that beta cell damage (needed for insulin production) starts with chronic elevation of 140 or more.
Each of these studies pertain to chronic/sustained elevation (that's what A1c measures, and I've read the beta cell research to counter people who insisted that even momentary blips above 140 were harmful - and because of the inaccuracy of meters only < 120 was truly safe). So the research doesn't give clean guidelines. Because I can, and because science is not clear, I choose to stay clearly in the safety zone (striving for normal BG at all times, including at 1 hour after eating).