Catching a thief hiding in 13 caves

There are 13 caves arranged in a circle. There is a thief hiding in one of the caves. Each day the the thief can move to any one of of the caves that is adjacent to the cave in which he was staying the previous day. And each day, you are allowed to enter any two caves of your choice.
What is the minimum number of days to guarantee in which you can catch the thief?
1. Thief may or may not move to adjacent cave.
2. You can check any two caves, not necessarily be adjacent.


If you have tried and still can’t crack it, here’s the solution;

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