To receive the most benefit from the travel policy you must purchase the insurance within 7 to 21 days (varies by company and plan) of making your initial trip payment. If the insurance is purchased within the 7 – 21 day period may you receive two significant enhancements (varies by company and plan) to the policy.
Please note that most companies count the day you make the first trip payment as day one and not the day when the check is cashed.