An expression meaning a large amount of something.
Derived from Trump's idea of a wall on the southern border of the US with Mexico, as someone's current location in relation to said wall would be a large distance.
Kid: I need you to fill this bag with candy from here to the wall.
Joe: Stacy gave us a giant list of things to do, I swear it was from here to the wall.
Bob: I have so much homework today man, it's from here to the wall.