The Dink Network

If I'm not mistaken the game allows only around 1000 sprites on one screen. I believe the limit was 999, with one being reserved for Dink so that would leave 998 signs per screen. A map can only have 768 screens, so one map could theoretically hold 766464 sign posts. This is all assuming you also use a script to place additional signs as in the editor you can't get past around 99 signs per screen. So that means 999 scripts per screen for a total of 767232 scripts per map file.

My point: To have 10000000000000000000000000000 sign scripts you'd still need 13046927187708750835004 map files to make it work.