True
A hackathon challenge hosted under the GDSC Korea program is structured as a 48-hour event, according to event materials published on the organization's official website.
The official event page on the GDSC Korea website (gwdckorea.co.kr) presents the hackathon as a challenge lasting 48 hours. The details are contained in the event's published materials, which describe the schedule and structure of the competition.
GDSC Korea, the developer community program associated with Google Developer Student Clubs, lists the hackathon on its site as part of its zone hack activities. The 48-hour window defines the total duration of the challenge, within which participating teams are expected to complete their projects.
The published event asset, hosted at the organization's web domain, serves as the primary reference for the event's duration. No conflicting information about the schedule has been presented by the organizers.
The claim that the hackathon challenge is held over 48 hours matches the details published in the event's official materials.
The claim is therefore assessed as True.