I would avoid that phrase since people may take it to mean you're admitting to being bad at thinking and therefore not a very useful employee.
Instead, I'd spin it to say you need more time to investigate thoroughly to give them an accurate answer.
Instead, I'd spin it to say you need more time to investigate thoroughly to give them an accurate answer.
If they don't believe you, tell them Derek Sivers, the CD Baby creator is also a slow thinker https://sive.rs/slow