When does payment end?

AnimalProgressFixture
new case	Sophie	Morin			Sophie's a heifer calf
diagnosis	wyitis
order	intensive care
day passes
check	balance	40
order	discharge				Farmers often do not pick up their animals promptly. They get charged the normal boarding rate.
day passes
check	balance	56
day passes
check	balance	72
released					Once released, no more charges accrue.
day passes
check	balance	72

No charges accrue after the animal dies.

AnimalProgressFixture
new case	21231	Peoria
diagnosis	renal failure
charge	50				cheap and easy diagnosis
order	intensive care
dead
check	balance	50
day passes
check	balance	50