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Reviewed in the United States on June 12, 2017
The LH surge is supposed to occur around 8am. The LH then takes about 4 hours to show up in your urine, so be sure to test in the early afternoon to find it. Ovulation then takes 12-24 hours, meaning 8pm the same day, and no longer than 8am the next morning. But the egg can only live for 12 hours, so you must assume that Ovulation has occurred at 8pm the same day as the LH surge or you can miss your fertile time, because the egg might no longer be viable by 8am the next day. So you must have sex the evening of your LH surge. Sperm takes up to 2 hours to swim to the egg. Sperm lives longer, so even if everything takes hours longer, the sperm will still be alive because sperm lives up to 5 days. But by having sex the evening of your LH surge, you will not miss your ovulation if it happens as quickly as it might.