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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.
Community Q&A. Intermittent fasting (also known as, IF) is the practice of periodically going without food for repeated periods of time, typically on the order of 16 to 20 or up to 36 hours and then eat. Then fast again after the flexible feeding window, the feeding period can slide and vary, as your schedule varies.