OK, I may have said 3 hours, but that is obviously teasing - but they can do it for at least 30 minutes period
If you snuggle up to a moon rock on a 30+ day pull probably even longer
The point is a barge or exhumer on the same asteroid can go a matter of minutes before something has rto be clicked or moved except maybe a retriever/mackinaw and even then only if it doesn’t have boosts
They are essentially able to mine AFKish - there is no disputing this. period!!