Missing payments. If you don't see a recent payment you've made, make sure you've allowed enough time for the payment to post to your account: Payments made by electronic check, by credit card, at a T-Mobile store, or over the phone usually post to your account right away, but it can take up to three hours.
Nothing in-game uses Kerbin days/years as far as I can tell. A day is defined as 86400 seconds, and a year as 365 days.
Best Answer: There are 365 days each calendar year, except for leap calendar years which are 366 days. A leap year happens every four years. Scientifically, there are 365 and 1/4 days in a year, because it takes the earth 365 and 1/4 days to go completely around the sun.