How long does it take to receive check after personal injury settlement is paid out?

I was in a car accident in September and received a settlement from the at-fault party in December. I live in Florida so the majority of my medical bills have been paid for by PIP. I only had a small amount (Less than $100) paid for by health insurance. My settlement check is currently in a trust held by my attorneys. It has been 5 months and when I ask for an update they say they are waiting to receive final bills from the medical providers. I finished treatment in November and received my copy of the final bill in December so I am confused about how they're still waiting 5 months later. Also, wouldn't they have this in hand in order to get a settlement from the at-fault party? They also want to go after my insurance UM policy and at this point, I am tired of waiting and am fine with the little amount I will get, so am I allowed to opt out of that? I wonder if that's why it is taking so long even though the UM claim has not started yet.