Many of the DCA lines are commutable. Many aren’t though as well. From what I’ve noticed it seems like if you are willing to accept trips that aren’t 20+ hours of credit you can make a schedule with the SAP that is almost totally commutable in DCA. Although you likely won’t have many 23 and 24 hour commutable 4 days. It’s easier to commute if you can avoid trips that begin and end on the weekend.