A few things to consider...
You will be one giant open wound. The chances for infection will increase each session. Do every thing you can to boost your immune system before, during and after each session. Are you traveling alone? Having someone to help you on during and after the sessions would be a great idea. You may not heal the same or as well as normal tattoos...think about the trauma to your skin and immune system.
Last year, I was tattooed five days in a row but they weren't all day sessions , like ~16 hours total and all different tattoos. It was enough. This past week, I did two sessions (one 4 and 1 five hour). I know for me, keeping my immune system healthy and managing the healing process are my top priorities.