use object lookup for convertDuration instead of switch #4002
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Basically, now the function has better readablity and time complexity:
Object lookup: O(1) average case
Switch statement: O(n) in the worst case, where n is the number of cases
The object lookup is constant-time to the duration mapping, regardless of the input value. Thiss is WAY more efficient, especially for larger sets of cases. and switch statements look unecessarily long in this case.