depends of the value you're owed. That value recharges over the time period of a week. You can look up the maximum value of an account
on this spreadsheet. (gotta make a copy to be able to put a name in. ) but if you go in the discord you can see the current upvote value. You need a minimum upvote value of $0.012 to get an upvote unless you're fully charged

My maximum upvote value is 0.245 but my current value at time of writting is 0.17

I think they just scale it around between different accounts because a upvote of 50% when you have 90% of your VP is worth more than a 50% upvote when you have 50% VP. I saw sbi2 upvote to 90% earlier.