The gui should really say ‘expected’ or ‘average’ time to ripen, the crops have only a few stages, but tick once a day, so to achieve growth times more than 2-3 hours it works on a poisson process, each day they have a probability of advancing to the next stage (so if the growth has expected time of say 80 days, and the crop has 8 stages, it has a 10% chance of advancing each day, so most days wont do anything, some days might advance once or even twice (and very very rarely 3, 4 or even all 8 stages at once), but the ‘average’ time to ripen will be 80 days, with some being slower (maybe much slower) and some being faster (maybe much faster)