I know that.
What I don't know is what the tolerance on that is.
If I am at 20 for a week that is dangerous. Apparently if I am at 7.5 for an hour, that isn't.
Somewhere between those two is a limit, a curve on a graph, nobody seems to know what it looks like.
The tolerances are here:
https://www.diabetes.co.uk/diabetes_care/blood-sugar-level-ranges.html
No apparent needed on the 7.5 for an hour not being dangerous: pretty much the entire global population will be at 7.5 for an hour each day.
The graph is an interesting idea. I think you mean for a well controlled T1, what is the risk of occasional spikes to various levels. (As we know higher Hba1c (which is made up of higher average bs readings) does correlate with increased risk of complications).
I think the problem we have in measuring what occasional spikes in BS mean for complication risk is that the data does not exist. Complications take decades to manifest, but we didn't have the huge volume of CGM data 20 years that we do today to try to answer this. In another 20 years we will be able to answer this. The exciting thing is with the surge in CGMs in the last year we're now capturing more bs data in the last year then in all the previous years since diabetes was identified combined.
Focus on your Hba1c, the target bs ranges in the link above... and remember complications are not all about BS management for diabetics. Read this from author of "Think Like a Pancreas" he puts BS control at only a 40-50% contributing factor as the cause of complications.
https://www.diabetesdaily.com/blog/...lood-sugar-management-isnt-everything-437583/
You can have perfect BS, but if you choose not to exercise for example you can still get the same complications but for different reasons!