how long ago

The phrase "how long ago" is commonly used to ask when or how many months/years in the past something happened. It refers to the time elapsed since a specific event occurred. For example, "How long ago did you learn to drive?" means asking about the duration of time from the present to when the person learned to drive. In terms of grammar, "How long ago was that?" is the standard, idiomatic expression, while "How long was that ago?" is less common and not considered standard usage. There are websites and tools that can calculate exactly how long ago a specific date was, including detailed breakdowns in years, months, weeks, days, hours, minutes, and seconds. If you want to know how long ago a specific event or date is, you can provide the date, and I can help calculate it for you. Otherwise, the phrase "how long ago" simply requests the duration from the past event until now.