Is this a world record? The GPT 5.5 ran for 19 hours

Absolutely, where this falls apart pricing wise is in business scenarios for weekly reports and large bag of word analysis where there is no caching. You feed a giant bag of words in and expect analysis on it. It forces you into slightly different workflows to keep costs down, lean on 5.4 mini for example and then do agentic validation with 5.5.