When completing a pull request in the challenge, it usually takes several hours before you can mark it as completed in the UI. What is the reason for this delay, and how can we get rid of it?
Also the reply "I can't confirm the PR on GitHub. If you think this is an error, please contact us." isn't very positive when you know that you have already submitted the PR:

When completing a pull request in the challenge, it usually takes several hours before you can mark it as completed in the UI. What is the reason for this delay, and how can we get rid of it?
Also the reply "I can't confirm the PR on GitHub. If you think this is an error, please contact us." isn't very positive when you know that you have already submitted the PR: