I guess my example IFNI bombs out.
However I can give you the longest inscription
in a postal date stamp:
"Field Branch, Bureau of Supplies and Accounts, Navy 10020 STA;
(Used in the 1960's)
...and what if you lived in this village in Wales, England?
(if you don't believe me, Google it :)
The only larger name I call, is the Thai name for Bangkok.
That goes for weeks.