Hunt grinding is more work than FCoB? Zuh? If you can find a hunt party there is zero work involved. Unless teleporting and taking part in killing the hunt sounds like more work than FCoB.
Assuming you get 15 of the 17 A Ranks per cycle, that's still 20 hours of hunts assuming every single one of them spawns 4 hours on the dot from the last one.
So one twine is, what, four A trains?
That seems considerably easier and more casual than bennu.
Around 4.5.
I think if you get one full A-train per day, you can get one oil and one twine a week.