CFB, AC, mee meep, i have not done a multi day ultra as of yet. am only doing first day of druids as i have a 9year old who has dance classes on saturdays lol so im doing just the friday stint of 30m. in 6 weeks i have northdowns which is 50miles so have some long runs planned for july.
AC, ultra pace starts off slowly..and gets slower lol..
anywhere between 9mm to 15 is normal, varying depending on terrain. getting used to longer distances goes hand in hand with refuelling on the run too and having your head in the right place.
CFB, on northants ultra we followed the Jurassic way for quite a lot of it.
and the march/shuffle /jog is sometimes what it comes to nearing the end of some!