How many days will I have to test for long cycles?
It varies. The best thing to do is figure out the length of your shortest cycle in the past six months, and begin testing on the day mentioned in the chart above. Continuing testing until you detect a surge or have a sustained temperature rise (at least 4 days, and at 0.4 degrees higher than the previous six temps.).
If your cycle varies by a week or so, you can expect to go through up to 10 tests. The more your cycle varies, the more tests you'll need. Example: Your shortest cycle is 28 days and the longest is 42, you would begin testing on day 11, but may need to continue through 20 tests, or even more. Note that this isn't common, but it is possible. About 90% of women will detect a surge within 10 days of testing.
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