Which of these sentences is punctuated correctly?


Although the concert doesn't start for over an hour; most of the fans have already arrived at the concert hall.


The concert doesn't start for over an hour; though, most of the fans have already arrived at the concert hall.


Most of the fans have already arrived at the concert hall; however, the concert doesn't start for over an hour.


Even though the concert doesn't start for over an hour; however, most of the fans have already arrived at the concert hall

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