You know ... there are planets where the weather changes drastically within a matter of hours. Where the seasons need only days to rotate. Perhaps it's not so much the duration of the seasons that's a problem as how quickly they change. Unless, of course, you're imprisoning species that can't deal with those changes, in which case, shame on you.
Come to think of it, how do you keep the animals from getting sick when summer and winter are so close on each other's heels? The fish at least ought to be going belly up.