Calculation of Total Time

Good Evening,

I have been trying to come up with a way to calculate total time an individual has worked based on note times they have entered. An example of how the data looks in excel is as follows:

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I have been trying to figure out I can get Excel to spit out the total time. For the example, I can see that User A has a total of 10 hours and User B has 17 hours. How can I create a formula or macro to do the same? Been racking my brain for a while on this but just cant get it to work. Any help would be great. Thank you.

This is a duplicate posting of one in Commercial Services. As such this thread will be closed.