3.5k/18 DC perfect run = 195 runs. Assuming you're 200+ and therefore have 18 stamina, you go through stamina 87 times and charisma about 30 times. So roughly 115 SCs spent if you do nothing but that all day long lol. The XP gain isn't high enough to consider level up a possibility, but even that's just -2 SCs spent. And this is assuming perfect runs all 195 runs (G tier with double drops this is possible at least)