How do you justify 270 days to be the time period after which a user is deemed not to be likely to claim their credits?
In the beginning credits were set to expire after 180 days. Assuming that… • …a user was primarily interested in the product that was updated the most frequently, namely the FMS Data, and… • …a user charged his account with the minimum amount, namely 100 credits, …a user would have credits for FMS Data revisions during 5 AIRAC 28-day cycles (5 x 28 = 140 days) given that… • …each FMS Data revision is sold for 20 credits each. This would leave approx. 1 month (40 days) Grace Period. Grace period means the length of time during which a user may use the Navigraph services without spending credits and still make maximum use of his credits. 1 month grace period was deemed to little. For this reason the grace period was increased to 4 months which gave a total of 9 months expiry period (270 days). The length of the expiry period can be debated, but in the end it needs to be the resulting spending behavior of all of Navigraph users that sets the limits so as to result in a balan
