I have taken both timed and untimed IQ style tests, and they honestly felt like they were measuring slightly different things. On untimed tests, I felt calmer and more deliberate. I could sit with a problem, try different angles, and eventually work it out. On timed ones, it felt more like pressure management than pure reasoning.
That makes me wonder what the untimed format is actually capturing. Is it closer to raw reasoning ability without speed getting in the way? Or does removing time limits introduce a different kind of skill, like persistence or tolerance for complexity?
Timed tests measure reasoning under pressure plus processing speed. Untimed tests measure pure reasoning ability and persistence without time constraints. Both are valid but different. Untimed shows your cognitive ceiling, timed shows functional ability in real situations. Neither is more accurate. Some people score 10-15 points higher untimed because speed isn’t their strength. Untimed favors deliberate thinkers. Most professional tests are timed because real life often requires quick thinking.