Hey @johje69 I think this depends a bit on how you are managing this, but in general, the lifecycle events (including extremely negative message) don’t generally “drop off” of disappear. They are recordings of events. Managing them, whatever that means to your organization, does not mean they go away - that would indicate they didn’t happen.
What could happen, is they age out of impacting any scoring, or as a result of a renewal or expansion the impact is mitigated that way.
This is in contrast to Insights, which are resolved by taking an action, e.g., reaching out to a customer, or reversing a negative sentiment trend, which is a bit more relevant to what you’re talking about.
If you have a specific report on “extremely negative messages”, and you want them to drop off you could use a date filter, and only include recent ones, though obviously that doesn’t tell you if they are “worked”, just doesn’t keep them indefinitely.
I haven’t tried this, but you could look into a report where negative messages don’t show up if there’s a positive sentiment insight in the relevant time frame, which might be an indirect way to see if there was the impact you’re looking for.