It also really depends on which "build" your are going for, meaning SS to a certain cap or no SS at all. It also changes which opener you use (since I rerolled from ninja against my will I build to have at least a certain amount of GCD full buffed, and I hagakure at 2 sen most of the time unless a mecanic prevents me to do it, or I need that extra 20 with 1 Sen to dash out/in or in/out of the boss).

It depends on the fight really, and how much you need when Guren come out of CD as well, sometime you need only 20, sometimes 40, sometimes all 60, but this last one is very rare for me. I'd say hagakure at 2 sen is my go to 90% of the time or else I overcharge the kenki gauge.