I saw a help request for the Rare Raid Boss (Level 100, 12M HP o.O) and I was like "ooh I want in and- Wait... ONLY 9 MIN LEFT???"
How long do those guys stay up? 12M HP to take down in 15 minutes is awfully... tough... unless you and your friends all have MASSIVELY high powered squads. My own squad recently passed 250k power total so... yeah, not happening lol