I use a 32GB SD card, fits 2 days worth of GoPro recordings with no prob. 16GB is ok too if you're putting in less than 2hrs/day.
Whether you want the highest resolution or not is a different story, I'd do some research on the wide-angle modes and frame rates available for each resolution, it varies per GoPro model.
e.g. I care about frame rate more than resolution so I use 720p/60fps with the medium wide-angle setting.
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