The current map I have drawn is 1750,1750 tiles and eats RAM for breakfast. When you add 7 layers for the server and 4 for the client they hog memory. Currently the plan was to host the server on Amazon AWS. The problem is that Amazon AWS free instance (t2-micro) only has 1 gig of RAM.
**EDIT – 08-25-2014** reduced the memory usage a bunch, but still have more map to draw
The map will be around 5300,3000 tiles by my best estimates. As a little teaser for you, here is the map that GM bluecrackpot and I drew.