How do I Max Size of Layout or Tiled background?

What is the max size of layout + tiled background that you can use? i am trying to use set X position 0 to my 8 directions player when reach the limit of the background but looks teletransporting and i don't want to do an auto runner, i am thinking to use a ultra big size layout, my game have a camera that follow the player like metal slug game.

i am testing a 999999px layout with a 999999px tiled background, i don't notice any performance issue but if i want to use a parallax background i don't know what will happen.

dont need to make ultra big size layour... you can use alot tricks for parallax

i am trying to modify the infinite jumping template to adapt this in horizontal mode!

if someone have a good tutorial easy to understand about this... i just want a horizontal infinite platformer.