Make Europe Last

This will be my last big adventure, and it ends when my money runs out or I can't manage the pain effectively anymore. I have no clue how to estimate how long the money I'm going with will last, but I'd hate to wrap up before I have to. Any amount will help get me a little further and help me experience a little more. Thanks in advance for anything you can offer. I'm landing in Ireland December 11th, and figure at a minimum, I've got a month or so. And if you have a suggestion on where or how I should spend the money,  please let me know. I love you all.