How quickly have you had to implement a feature after seeing the response from your launch?

Within 2 hours of releasing SolveX yesterday, we had to release another update to improve the gameplay of users. As soon as we released a way to remember people's game history, we witnessed a huge improvement in our users' experience.

And that makes me wonder, what's the quickest you had to implement a new feature for your product and what was it? Share your story with me.

Our product hunt link: https://www.producthunt.com/posts/solvex-guess-the-equation
Try solving today's SolveX: https://dejourn.com/solve-x