According to Ebbinghaus's Forgetting Curve one is likely to retain only 63% of the material learned after 9 hours and after a month that figure drops to 21%.

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Ebbinghaus's Forgetting Curve suggests that memory retention declines rapidly after learning, but the specific percentages can vary. The curve generally shows a steep decline initially, with retention dropping significantly within the first few days, not specifically to 63% after 9 hours or 21% after a month.

According to Ebbinghaus's Forgetting Curve One Is Likely to Retain