What's the max auto fishing time reduction?

I've seen that on one article it's 66% and I just want to confirm if that's true or not? Like how do people figure this out.

Also, was the triple float fishing rod repairable in the past but now it's not?

And what's everyone's opinion on maple float vs ash tree float? I saw in some spreadsheets that raising the chance to catch big fish does raise rare fish gains and vice versa. But it seemed pretty outdated