A fit walker could easily traverse the coastal path around Holyhead within a day.
This section of the coastal path, is gentle walking compared to say Amlwch or Moelfre, and when you are nearing Trearddur Bay, the going is very easy.
If you were walking in the height of Summer, when there are many hours of daylight available, the Holyhead section of the Anglesey Coastal Path, is a long day out.
The only problem is that there is a lot to see on this section , wildlife and possibly a look at South Stack lighthouse, so its a section of the path that offers the visitor lots to see and do, which cannot be said for the majority of the path.
Its the section of the path past Trearddur Bay, heading towards Aberffraw and Newborough that offers the walker little in the way of interest, its still beautiful, but apart from the view, there is nothing much to do.
Holyhead Island, on the other hand, is a hot spot for rare birds, Choughs and even the incredible Black Lark that set the twitching world alight several years ago.
Of any section of the coastal path, Holyhead offers the best opportunities for a diversion off the path, to see what's on offer, and therefore it would be a shame to rush it.
Its doable in a day, but you would miss the highlights on offer.