Suppose I need to refer something in the past by saying
Oh, I remember you did that ___.
I remember the event in the past, however I don't remember at what time was that event happening. It could be 10 days ago, 2 months ago, or it happened last year.
Note that I remember well the event on the spot but not the time. What should I say to fill the blank in the highlighted sentence above? I don't think I'm going to use a few days ago, because it could be a few months ago.
In my country, literally we say "a few times ago" to describe indefinite time. I've looked up, but seems like there's no such thing as that phrase in English (I'm not sure if I missed something). I also think that long time ago is a bit too much and will sound like I remember something that happened many many years ago like telling a history.