Counted how many hits it took to complete the Sigh bar on Counter Culture, with a rough estimate on how much HP it has Took me 30 hits with an average damage between 100 and 110. So I'm guessing it has 3000 Health. Maybe at some point we (as a community) can catalogue how much health each party bar has and get a full point breakdown for all parties.
There is this party guide that I believe contains most of this information for everything except for pro parties. Has some nice info in it