You travel to Point Lookout instantly via steamship, there isn't any sort of indication of time passage unless you check your PipBoy after arrival; travel between DC and Point Lookout is practically instantaneous.
A wasteland is barren and inhospitable, almost devoid of any life, neither the Capital Wasteland or Mojave Wasteland are actually wastelands because they're small regions that are too densley populated by people (whether they're civilized settlements or raider hangouts) and creatures. When the Vault Dweller or Chosen One are traveling on the world map in Fallout and Fallout 2, most of the time they're seeing nothing but endless brown with some deserted urban ruins here and there for days at a time, Fallout 1/2 did a good job at presenting the wasteland because they allowed the player to get a good idea of what it was like through a practical system without boring the player because make no mistake - traversing across a proper wasteland in the style of Fallout 3 and New Vegas would be boring.