title: How can I make a ggplot2 scatter plot using lubridate hours in R?
body: <p>I have a set of hours (some greater than 24) that represents the time some students spent on studying sessions. I want to make a scatter plot of studying time and exam results using ggplot2. The thing is the total time data is in lubridate's time format, how do I plot using this? Example:</p>
  
  <pre><code>            Name          ID           Total Time  Results
  1         Student1      xx-xxxxx-xx    9H 56M 0S   37.58
  2         Student2      xx-xxxxx-xx   10H 28M 0S   73.89
  3         Student3      xx-xxxxx-xx    6H 40M 0S    4.14
  4         Student4      xx-xxxxx-xx    3H 22M 0S   33.44
  </code></pre>