Lets assume this AFK miner is actually put some points into mining;
Med Miner fit with Tuners and EP + 100% Yield 8s cycle time
HDT 750 * (1 +1) = 1500 / 8s = 187.5 ore/sec
Liquizit 225 * (1 + 1) = 450 / 8s = 56.25 ore/sec
So not including reload times, it would take;
Lithus 240 U
HDT 4,800,000 [25600s] 7.11 hours
Liquizit 1,200,000 [21333s] 5.93 hours
Same Player in a Riveler has (5) med miners with same skills will do the above in 1/5 the time.
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In comparison, a new player in a sequar with Small Miner, 18s cycle time and only 50% bonus.
HDT 750 * (1 + .5) = 1125 /18s = 62.5 ore/sec
Liquizit 225 * (1 + .5 ) = 337.5 / 18s = 18.75 ore/sec
*Can't drive Lithus - Seq doesn't have enough AP to run Med (if it will even take one)
HDT 1,600,000 7.11 hours
Liquizit 400,000 5.93 hours
The reload times will make this a little longer, but here is the final comparisons
HDT -
1,600,000 7.11 hours [New Player in sequar]
4,800,000 7.11 hours [Advanced Player in Lithus]
4,800,000 1.42 hours [Advanced Player in Riveler]
Liquizit
400,000 5.93 hours [New Player in sequar]
1,200,000 5.93 hours [Advanced Player in Lithus]
1,200,000 1.19 hours [Advanced Player in Riveler]
Also note that setting speed to 0 no longer works for bot time out, so the AFK Hauler would still need to do something occasionally or be timed out, so they can't just go to sleep and wake up in the morning.
HDT at .50 NIC/ORE is about 200k per 8 hours. I'm not feeling this is broken at all.