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Sorry, I am not an expert at the math. All I know is that it replenishes at a constant rate, and if you vote exactly 40 times within 24 hours, you will not use it at a rate faster than it recharges.

No it replenishes exponentially! The lower your voting power is, the faster it replenishes. But no matter how far your voting power is under 100%, it will always take 5 days to get back to 100%.

Unless something has changed that i'm not aware of...

I admit I am not an expert on this, but I don't remember it ever working that way.

I'm certain that's the way it worked when i researched it (probably about 9 months ago), but i can't confirm if they altered the algorithm since. I'd have to do an experiment to confirm, but i'm rather busy currently :(