From past experience I'd say he'd probably forgotten the time.

根据过去的经验，我想他可能把时间忘了。

《牛津词典》

She had forgotten the whole experience. But suddenly this childhood memory returned to mind.

整个事情她都已经忘了，但突然这一儿时的记忆又回到了脑海。

youdao

No denying that anything that's material cost money, but the fact remains the cost of the experience will be forgotten, but the experience never.

不可否认的是所有的物质财富都需要花钱来购买，然而事实是经历的代价会被忘记，体验本身却永远不会。

youdao

But for those of us fortunate enough to sample life in Japan, it has been an experience never to be forgotten with a thousand memories to be stored away forever.

BBC: World Cup memory lane

He seems here to have forgotten a truer observation of his, taken directly from clinical experience: in face of violence and humiliation, victims will turn also on each other.

ECONOMIST: The roots of prejudice

Publishers have forgotten that the best way to make money is to start with an engaging experience.

FORBES: The Future of the Newspaper