I'm not a superfan of lawyers, but they got 110 out of 650 millon or a little over 16% of the total settlement. For 5 years of work and the very real risk of getting nothing if they lose, that sounds reasonable to me.
For 5 years of work.
Yes important point, but also probably not 5 years of active work. I'm sure they were doing other things, performing some steps and then waiting for others to act, etc. You don't "work" 8 hours to make a crockpot stew