Salem

Not sure if I was wrong on it, but is it still 8 hours?

Yea, I think it's still 8 hours. Is the green bar all the way up? If so you may not have enough brain in the tub. I've got one tub that I accidentally messed up. It says 31 liters of 5.0%, but it's a rounding error. It's actually a smidgen less than 5.0%, and won't tan anything. Only thing I know to do is chuck in another brain, tan three hides, then empty the blasted thing.