How to spend your time when you are waiting for a Data Analysis Output

The job of the data scientist is very challenging: your knowledge must span from data mining to data analysis up to data visualisation. However, what happens when you launch a heavy computation, such as a Machine Learning algorithm on a big dataset? You stop and wait for a result. You may watch you screen for hours, in the hope that your script finishes. Anyway, this is not the best way to spend your time.