How long will a tattoo take?

im thinking of having a tattoo im not sure where im quite punky so im thinking of following the sheep and going for something behind the ear something like a star about the size of a 50p thin black outline blue coloured in im only asking cos im having another tattoo finished and im trying to workout when to have it done please only real answers i dont need reviews or opinions i dont need no it alls to tell me not to have it there or that it hurts if i want to know anything other than what ive put i would have put it dont meen to be rude but not in the mood for point snatching turds though im sure ill get some real answers will be appreciated fakes will be remembered and blocked cheerz x