100m/h... I thought I was getting this not so long ago with platinum/osmium
basically using an anaconda, which had something like 320T capacity, and was selling to a freighter into the same system (as rings) for around 240k.. , so that was something like 85m - and iirc, was able to fill in less than an hour.
( actually, I think the platinum price was a bit higher when I was trying, closer to 270k?, as I think I taking a small hit by giving to freighter... but worth it for time saving)
also, you dont get much less with something like a Python... IF you can deposit quickly to a local freighter (so your roundtrip time is kept very short)
all that said, it was a few months ago.. my numbers might be slightly out... within the ballpark iirc.
but the RNG is important... as the mining was really consistent, like within 5 minutes, to get that rate.
whereas my experience with exobiology so far is its pretty variable.
then again, I did get bored of mining, (an hour hitting rocks was pretty tedious

)
so, doing exobiology, even for less was a nice change up.. and you get to visit the worlds.
its also, why I switch over to the war effort, perhaps a bit less payout, but variation keeps things interesting.
anyway we will see.. my expectations are low that fdev will fundamentally change this much, perhaps just the ranking, and fix the UI - if we are lucky.