Gifted and Reading

Do people with gifted verbal IQ’s only have to read something once to understand it? For example, take David Humes Treatise Concerning Human Nature or a book by the economist Keynes. Would a 130+ only have to read these once to understand or multiple times?

Edit: A bug thank you to everyone who responded. You’ve eased my anxiety. I’ve been reading some very difficult texts (philosophical and economic) and was getting worried about my intelligence.