I primarily use volume charts with a minute chart just to keep an eye on volume. I am looking for a simple indicator that will plot as a bar the time it takes for a volume bar to complete to function as a volume proxy. So it would look like a minute chart with volume bars, but be instead a volume chart with time bars. A short time bar would equate to a high volume for that volume bar. If it too a long time to complete the volume bar, the time bar would be higher. Simple. I'm not much of a programmer, so looking for what may already be out there.