Some of us would drop the 'only' and add an exclamation mark or three. It is close to my limit if head winds and rain join the party. That's just the challenge of doing it. My objective is simply to get there. Well get there before closing time - or what's the point? I hope not to be a burden but pushing too hard when you are shattered is not the Friday way - or giving up IMHO. I really don't like thinking in target time terms. That's Audax territory.... it's only 113 miles overall
Bottom line is getting back isn't as important as getting there and getting there comfortably. I possibly have a couple of bunk beds in Southwold (plus floors) for anybody who misses their train.