L.D.
I don't know what state your daycare is in or if this applies, but in Missouri, a child can only be in daycare for up to 9.5 hours a day, even though the daycare may be open from 7 to 6.
As far as the fever issue goes, it really depends on the daycare as to how they handle this situation. My firend's daycare always makes her get her kids even if their fevers are very low grade. At our center, they will give Tylenol for a low grade fever, if there are no other symptoms, especially if they suspect the fever is a symptom of teething.
During the cold and flu season, teachers are probably doing whatever they can to try to prevent children from getting sick, so while it may seem inconvenient to pick up your child early, it is probably best for everyone.