Have you tried the Page Tool, holding down the ALT key while dragging an anchor point you will be able to extend the page size to any length/width.I found that using it in a Master page works best if you want to extend all the pages, but it certainly can be used on single pages within your page layouts.
I hope this helps you.
It's going to depend on the compatibility level of the PDF you want to create. The limit for PDF with Acrobat 6 or lower compatibility is 200 inches.
The page tool won't allow you to exceed 216 as far as I know, but if you turn off page shuffling you can drag up to 10 pages together into a single spread, so you could in theory create a spread up to 2160 wide, though I suspect it would be rather difficult to work on. If you place the image across the spread you can export to PDF with the spreads box checked and the result will have only one page.
Brilliant solution Peter!
Now just gotta see how Acrobat likes that.
OK, yeah so no work around for Acrobat. Even Acrobat 7/8 wont do it. 200in limit.
This could easily be another InDesign limitation. When was the 200 inch page limit broken ? (Accessibility) implies it should be doable, but Maximum Acrobat page size (Create PDF) seems to imply that Adobe apps won't save that large. You might want to ask about this over in the Acrobat forum.
Apparently Acrobat supports 15,000,000 square (15Mx15M) page sizes as long as the printer supports it.
Not sure about ID itself but as I stated in another page you might be able to use a different Adobe application to author your file and print with Acrobat that way.
15,000,000 inches = 236.7 Miles
This sounds like the one paragraph short story by Jorge Luis Borges. "On Exactitude in Science"
. . . In that Empire, the Art of Cartography attained such Perfection that the map of a single Province occupied the entirety of a City, and the map of the Empire, the entirety of a Province. In time, those Unconscionable Maps no longer satisfied, and the Cartographers Guilds struck a Map of the Empire whose size was that of the Empire, and which coincided point for point with it. The following Generations, who were not so fond of the Study of Cartography as their Forebears had been, saw that that vast map was Useless, and not without some Pitilessness was it, that they delivered it up to the Inclemencies of Sun and Winters. In the Deserts of the West, still today, there are Tattered Ruins of that Map, inhabited by Animals and Beggars; in all the Land there is no other Relic of the Disciplines of Geography.