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PSA: If you have been having stutter/FPS lag on Disco where it does not run as smoothly as other games, please look at the fix here: https://discoverygc.com/forums/showthrea...pid2306502
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It varies on do you mine alone or in group, what route do you fly, do you use shortcuts like jumpholes or just go by the lanes, depends on pirate activity...
Generally I think something around 50M / hour, or in some cases even more.
Solo mining is hard. You can only use the Hegemon (2700 cargo). The ship is bad in lanes and easy target to every enemy you meet. I advise you to mine in a group, load a transport and fly that one. More cargo, more profit, easier laning, better changes against pirates.
I would got for ~ 40 mil per hour, at the moment.
If you are a starter and want to make money, some factions have bases that allow storage of ore, so you can mine it (in Hegemon) and pick it up for the same price on your transport. That's the only way of "solo-mining" at the time that works reasonably well.