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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.
For some, intermittent fasting, or going a longer period of time â usually between 14 and 36 hours â with very few to no calories, can actually be a lot easier than you may think, and the benefits might be worth it. If you think about it, all of us âfastâ every single day â we just call it sleeping.