[Python] How to plot timedelta as value with matplotlib

I am trying to plot a duration in seconds with respect to some iteration values. I compute the duration values by substracting two datetime values. Then, I would like to plot these results in a very simple way using existing tools.

My code is the following but it doesn't work yet:

#!/usr/bin/env python

import datetime
import matplotlib.pyplot as plt
from numpy import arange

it = arange(10)
durations = [datetime.timedelta(hours=h+30) for h in it]

plt.plot(it, durations)

plt.show()


I got the following error:

TypeError: float() argument must be a string or a number


I know that I can make it work by using datetime instead of timedelta but my goal is to plot duration in hours (around 40 hours) so the rendering is not good.

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