Is There Any Approach to Calculate time Complexity if We use Branch And Bound Approach?

i am currently solving Assignment Problem using Branch and Bound Approach to reduce total states…
but getting TLE exceed… even to work further on it i am not able to calculate time complexity of my branch and bound type of solution

Can any One tell what is complexity of my solution?
solution1 Branch and Bound using DFS
Updated Solution2 Branch and Bound Using best First Search

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