You need to convert your time, which I assume is text, into milliseconds.
You can now plot this value. You may also need to create you own dummy axis to display the milliseconds in the time format.
Can you post a example workbook of your time values.
To examples. As you data is equally spaced I used a category axis.
In case your real data is not equally spaced there is also a xy scatter chart.
You will see I have used cells to break the time done into values (please check my logic as its late here are my conversion from time to millisecs might be wrong)
Your logic is fine - even if it was late - with the 2 answers you have given me I have been able to get over the (current) problems I have.
Guess I'll have to readup about Excel functions.
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