>>19914
I would keep the resolution of the markers where Q put them. In other words, we were given 0, 1, 5, 10, 15. To carry that on out, we need 20, 25, 30, etc. We don't need all the minutes in between like 22, 23, 24… That would create too much noise in the graphic.
Next, post all the [20] markers together. Place the earliest ones on the left and the latest on the right so that you preserve the order the drops were made. Do the same for the [10], [5] and the others.
I would use a minutehand clock. At the top of the graphic would be the clock and at the bottom would be a legend that held all the markers.
If you can fit the marker graphics next to the clock, that would be better if you have room. But there may be too many graphics. You may need to get the graphic very large so that the clock and all the images are readable.