It's one race each day at 5 am ET for four straight days (going up in distance) starting at 5 am ET on Thursday.
Charboneau, who ran her 2:33:14 pb to get 13th at the US Olympic Marathon Trials, ran the following times - 17:36, 36:36, 1:19:18, and 2:45:15.
Apparently, A LOT of people run all 4 races - which is called the "Dopey Challenge". I think more than 5,000. if I counted correectly in the results
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Article:
Results:
https://www.trackshackresults.com/disneysports/results/wdw/wdw22/Dopey%20Challenge.pdf