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Rating Newest Oldest. Best Answer: 8 to 10 hours is considered FASTING. You should be testing BEFORE each meal, and then again TWO HOUR after each meal. If you are under control, the FASTING reading (first thing in the morning, before breakfast) should be low-normal, like 80-100.
If an intermittent fasting program tells you to fast for 16 hours, you shouldnât disregard that and decide to fast for 100 hours. As long as you donât do anything crazy like that, then thereâs really nothing dangerous about IF.