It's ridiculous to expect total recall or anything like it.
Total recall?
When he could not recall if he was making love, if he was working on the computer1, if he was watching a film, if Amanda went out.
None of these requires superhuman memory.
Do you really believe that he did not remember any of these the following days?
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1 while the mythical screensaver evidence (LOL) allegedly shows that he was working on the computer uncessantly all night long