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That's a luxury that many people probably don't have, as most people have to get things done under certain timelines.

If the timeline is so tight that there's no buffer zone for QA, exploration, etc then someone isn't doing their job properly.

Either expectations set by the developer, improper buffer added by the project manager, or lack of push back against the client.

If your timelines are so severe that you can't spend five minutes reading the jQuery docs in a day, it might be time to look for a new job.