This DIY Walking Tour of Dublin is just 5 kilometres long (about 3 miles), and takes in most of the attractions of the northern part of central Dublin that you’ll want to visit:

James Joyce Centre > Hugh Lane Gallery > 14 Henrietta Street > Jameson Distillery Bow St. > Four Courts > Millennium Bridge > The Irish Rock ‘n’ Roll Museum Experience > Ha’penny Bridge > O’Connell Monument > O’Connell Street > General Post Office > Custom House > Famine Memorial > EPIC Irish Emigration Museum > Seán O’Casey Bridge > and finally returning to George’s Quay.

And because it’s a DIY walking tour of Dublin, you can take it at your very own pace; stopping for a coffee/snack/drink where, when, and for as long as you like; lingering at the attractions of Dublin which interest you (and speeding past those that don’t).

As normal walking speed is around 4mph (7kmh), if you were to simply rush round without stopping, you could easily complete the walk in 2 hours  (you just wouldn’t actually see much though). So I would recommend taking a full day to complete this route around the northern part of central Dublin – as there’s just so much to see and do (and splitting the walk over two days would be even better).