I've read that it is 500 - https://steemit.com/hf19/@abh12345/hf19-pulling-the-ladder-up-or-more-encouragement-for-minnows-to-buy-steem-targeting-500-steem-power
My original strategy was to upvote people who made positive contributions on my posts.. but after sending the voting power to near 30 I'm going to have to rethink that..
Good evidence in support of the need for a slider for all. Or maybe different default powers for people who don't have a slider for post upvoting vs comment upvoting.
Or perhaps a button to toggle 25% or 100% voting power?
That might work, slider can be hard to use on a phone.