Sorry, it was late last night when I posted that and I was on my way to bed, so I didn’t have time to elaborate. But if you’d read the post I linked to, you’d have seen that code column accepts an integer value as input (number of minutes).
So to use it and get the correct results, you’d first need to convert your duration into a number of minutes with a Math column. Or if your current duration is the result of a math column, adjust the formula to output integer minutes instead of a duration - eg. Round((End - Start)*1440). Then the code column will give you the correct results.
That said, having now read the rest of the responses in the thread, it’s still not going to help for your actual use case, because it will be returning a string.
Personally, I’d use quickchart. Then you can put whatever you want on the chart, anywhere on the chart.