When you purchase your policy, Verifly calculates the estimated time remaining until night. If this is over an hour, you are offered a standard policy. If this is under an hour but more than 30 minutes, you will be offered the ability to self-certify for night insurance if you have an FAA waiver. If you do not or you decline, you will automatically offered a 30 minute policy. If you are within 30 minutes of nighttime, you must self-certify for night flight insurance or you will not be able to purchase a policy until the following morning.