As I'm farming an Ash head in Arva Vector, I have to take a nearly 25 min defence run for Tier C to get a chance of 10.26% to get that head.
Entering the ship takes about 1 min (one shatter blast enough), but it will be much longer in Obol Crossing since there will be at least 1 sub-objective.
And this defence may take at least 25 min (no less than 20 min I think) to take a Tier C Reward
So does all the THREE PARTS
Let;s make it nearly guarantees runs, 73±21 and 25 30 min per run (for the longest one in Pluto), it will take a CERTAIN OF 1300~2350 MIN (21~40hr) 1560~2820 MI