AR 40-66, Chapter 13 DD form 689(Sick Call Slip), pages 134-135, 13-3, 4b, 2b QUARTERS: When the patient is returned to his or her unit or home for medically directed self treatment and is not to perform military duty until a medical officer indicates that he or she may perform such duties. (Note: the medical officer will indicate in the Remarks section the duration of the quarters status in number of hours, and indicatethe inclusive period (for example, Quarters, 24 hours, 0730, 17 May until 0730, 18 May 95). Quarters status will not normally exceed 72 hours.
Disclamer: Read more into the regulation before you just get a quarters slip and either head back to the barracks or your house. It goes on to say that the sick call slip must be taken back to the unit either by the individual or some kind of runner.