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SUBMIT YOUR IDEAFun Problem. The provided solution is slightly off. On 5 of the records it takes the longer route to the next letter (left vs right). So it ended up adding two full minutes. The error is in the logic of the multirow formula.
Might be the first time I feel I improved on on the provided solution.
Solution attached. Matt Damon would not have made it, if I had not been able to look to other solutions for guidance.