I'd suggest you stay and do it over two days.
500 miles is do-able but it's pushing it and you won't enjoy the riding so much as more comfortable chunks.
There's also a risk that if you get very sore it may take some days to really recover, affecting rest of the trip
But if you decide you want to blitz it can be done, trickt is regular stops before you start to get sore se not after, and just take your time, steady progress don't rush it
500 miles is do-able but it's pushing it and you won't enjoy the riding so much as more comfortable chunks.
There's also a risk that if you get very sore it may take some days to really recover, affecting rest of the trip
But if you decide you want to blitz it can be done, trickt is regular stops before you start to get sore se not after, and just take your time, steady progress don't rush it