As part of the hardfork 21 there are 2 manabars: The principal one for upvotes and downvotes (the one with 1 million rshares per vesting share), and the second one only for downvotes (250k negative rshares).
Stupid question: if someone were to do two 100% downvotes per day, would the manabar with 1M rshares per vesting share remain unaffected?
You can cast a 100% upvote every 2.4 hours to get maximum effectiveness.
With HF21, you will be able to cast a 100% downvote every 9.6 hours for maximum effectiveness without effecting your upvote manabar.
Interestingly, if you keep your upvote manabar at max, I think you can do like 12 "full power" downvotes at the same time, which just about exhausts the downvote manabar completely. At which time you can wait for the downvote manabar to go back or dip into the main bar.
Ah right, because the whole thing is based on votes (actually recharge) per five days, when we usually think of it in votes per day terms. Good point.
Yes, you are right. To be exact it is 12.5 full power downvotes.
Remain unaffected. As netuoso said you will be able to cast a 100% downvote every 9.6 hours.
Then you can make 5 downvotes (100%) in 2 days without affecting the principal manabar.