I have a relatively large tattoo on my back (just done today actually) and it cost �80 and took roughly an hour. My tatooist bills by the hour but if you actually have more intricate work done requiring a lot of detail it actually costs less, (my sisters last sitting was about �60) than a design like mine. This is because mine was over with in one go whereas she has had to have some of her work done in stages, same as her boyfriend. (Mind you, they're also friends with the tattoist!)