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》

He added a little sternly, "Have you forgotten that this is spring cleaning time?"

他又稍微严厉地加了一句：“你忘了这是春季大扫除的时候了吗？”

youdao

You all came into a conversation where you first met the person, but after some time you may have met again and have forgotten their name.

你们都是在一次谈话中第一次见到这个人，但过了一段时间后，你们可能再次见面时已经忘记了他们的名字。

youdao

While many plays by other writers of his time have been forgotten, Shakespeare and his art live on.

VOA: special.2010.01.13

Now Buckle is a forgotten name today, but at one time he was just about as famous as Oswald Spengler who wrote The Decline of the West.

现在巴克尔已经被人们淡忘了，但他曾和写《西方的没落》的,奥斯瓦尔德，斯宾格勒一样著名。

耶鲁公开课 - 文学理论导论课程节选

Have you ever forgotten somebody's name at exactly the wrong time?

你是否曾在最不应该的时候,忘掉了某人的姓名？

耶鲁公开课 - 心理学导论课程节选

She will not be forgotten any time soon in the region where she had such an impact.

BBC: Margaret Thatcher and her impact on north-east England

But the pages of these books are filled with remarks that have been forgotten over time, even if their authors have not.

NPR: Book Collects Greatness in 'American Speeches'

Sure, they may remember a few items, but if you are discussing a process or a pattern, the details about the value or necessity of what you wrote may be forgotten over time.

FORBES: Don't Write Reports; Present!