26.2 miles; all marathons are.
The reason is that the distance from the Plains of Marathon, the site of the battle in Greece, was 26.2 miles from downtown Athens. The Athenian citizens were preparing to evacuate the city via their navy. The Athenian army was trying to hold off the invading Persians. When the Athenians were victorious, the general dispatched a messenger named Pheidippides, who ran to the city, announced the victory, and died on the spot.
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The difference between the various marathon courses comes in their terrain, rather than their distance, ranging from extremely fast, flat courses such as Chicago to more challenging, hilly courses such as Boston.
The Boston Marathon is 26.2 miles long.
The time will vary widely on each person completing the marathon as it is 26.22 miles. The world record is 2 hours and 4 minutes. Many others under 3 hours and most much more than 3 hours.