I did about half of that yesterday, then decided I'd cycled through enough bogs. I've done it twice before and it is a good route and in the dry is very much doable on a road bike, but yesterday wasn't helped by the rain during the week, and the gales on the day.
https://www.komoot.com/tour/58221191?fbclid=IwAR3Vct8oFd4tmALiiFMbmsj_-TbMTqe-NOQPBUqZR9nrVsxj5E_5q0EZNjI