I would say 2 days at at DLR feels like about 4 days at WDW. Enough time to hit all the headliners and see a few shows, but not nearly enough time to take most everything in.
3 days at DLR feels like 5-6 days at WDW. Enough time to cover most of the parks and no need to feel extremely rushed. But you know you still missed a lot.
4 days at DLR feels like 7-8 days at WDW. Enough days for a very solid visit, time to stop and smell the roses, and enough time that when you leave you feel like you really experienced a lot without killing yourself.
5 days at DLR feels like 9-10 days at WDW. Enough days to feel like you really enjoyed the resort at a slow pace and did not miss anything you really cared about while also seeing a lot of things you usually would just skip.