As of update 33, you will be able to run a character from Ered Luin to Mordor, with the only loading screens being the inter-territory teleports (between Eriador-Rhovanion, Rhovanion-Gondor, Gondor-Mordor) provided your character meets the requirements for those teleports, and the character survives the run!
When I read that all I could think of was an expanded chicken run. Sorry, total tangent there.