"How can this government ignore honest, well-meaning young boys and girls?" asked 27-year-old Atul Yadav, who has refused food for three days.
Medical volunteers, including Dr. Nitin Dighe, monitor Wangchuk's vital organ functions, noting he refuses extra cooling fans to share the crowd's suffering.
Prominent figures, including Congress MP Shashi Tharoor and over 1,800 personalities, have urged Wangchuk to end his fast, calling the struggle a marathon rather than a sprint.
If Wangchuk's condition becomes critical, observers expect the government will transport him to a hospital for force-feeding.
The CJP has organized a march on parliament to coincide with the first day of the new legislative session on Monday.
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"Come for the rally on Monday. Come to show your support," Wangchuk whispered to supporters who gathered past 9pm on Wednesday.