If you are mentally strong, you will excel under pressure and perform better than usual when you have three interviews in row. This will keep you on the edge and you will ace the second and third interviews.
On the other hand if you have not properly prepared and lack of confidence, you will crush and burn easily. You will not recover from the imperfections on the first day, and mistake will haunt you and make you second guess yourself.
Three full day interview will take a lot out of you physically as well.
I did 20 interviews at Mid-Year in 3 day span. It is doable, just be prepared.
Make sure you know your CV inside out. Know each sentences you have in your resume. Know the residency site. Have a story for each of the top 100 interview questions. Not just answers, but a one minute story for each question asked. A joke here and there will really improve your chance.
Remember they are looking for someone they have to spend a year with, someone who can get along with the team and someone who can contribute.
Good luck.
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