Booked a great C fare IAD-DXB, DXB-SIN and then SIN-IAD. Grabbed it and didn't really pay attention to the logistics. Just took a look and realized that on the return trip SIN-IAD I have a seven hour flight SIN-DXB, 1.5 hours layover (at 230 am!) in DXB, then 14 hours flight DXB-IAD. Pretty hefty penalty to change the ticket at this point to extend layover in DXB. Did I really screw up and should I suck up the change fee and hotel night in favor of a longer layover in DXB?