I need to adjust (extend) an audio track in order to match the length of a video clip

I have a video footage of about 7 minutes, whereas my audio track is about 3:14 minutes. The audio track should be stretched and adapted to match the video length. This should be done in such a way that it matched the video content (screen cast) and that it still sounds harmonic. The audio clip to be used can found here: https://www.youtube.com/watch?v=af4xGlOsXUk

Unfortunately, the video footage is not ready by now but will be finalized by tomorrow and can then be shared. I would need the adapted audio clip next Monday.