It's easy enough to figure out the number of car and track combinations in GT6. There are 1199 cars (number of cars shown in a wide open search in the game) and there are 115 different layouts (taken from single player track selection). Simple multiplication would tell us there are 137,885 car/track combos out there.
This includes all dirt and snow tracks as well as tracks that we don't use due to lap times being too long or the track being too buggy. This also includes cars that are over our credit cap. With all that taken into consideration, the number of available combos for SNAIL to use would be a lower number than what is listed above but is still a number that would take many, many years to get through.
Example: At the rate of two completely unique and unused combos each week, it would take roughly 1041.6 years to get through 100,000 different combos racing 48 weeks a year.
