All writers need a vacation, regardless of the writing season. The stress of the job is such that any writer will burn out if he is not given a break sometime in the middle of the current academic year. I rotate my writer's vacation time. I offer them the opportunity to file for vacation time at the office. All they have to do is inform that they will not be accepting any work at the moment and they are considered on leave. The no work, no pay policy applies of course. I do not mind the writers going on leave because they come back fresh, rested, and ready to work.
Avoiding writer burn out is a high priority for my HR team so when they see that a writer hasn't take any leave time yet during the year, they force the writer to take 1 week off. If the writer doesn't want the leave, we force it by simply not assigning papers to him. He gets a vacation, whether he likes it or not. The veiled vacation time usually works and they never know they were forced to take a rest from their jobs. The result? A writing team in peak health, ready to take on any paper thrown their way.