I'm afraid not. It would work if you replaced "let alone" by ", not to mention".Recently I said the following sentence,
"Everybody should be equal before the law. This is one the cardinal articles of human rights all around the world let alone this institution. "
Does it work for you?
It's a device for making 'a fortiori' points. Given that I can't remember things that happened 15 minutes ago, a fortiori I won't remember anything that happened 12 hours ago.I cannot remember things that happened 15 mins, [so how can I be expected to] remember things that happened 12 hours back?