Brazil's congress has approved a constitutional amendment banning six-day workweeks and capping the working week at 40 hours, down from 44. The vote — 75 senators in favor, one against — hands President Lula a concrete legislative win less than two weeks before the presidential runoff against far-right senator Flávio Bolsonaro, who leads after the first round. The lone dissenter was Hamilton Mourão, former vice-president under Jair Bolsonaro. The amendment will affect more than 30 million workers, with 16 million currently on six-day schedules. The impact lands hardest on retail, restaurant, and hotel workers — overwhelmingly low-paid, disproportionately female, and precisely the demographic cohort where Lula hemorrhaged support since his 2022 victory over the elder Bolsonaro. The reform's origin story is itself remarkable: a TikTok campaign called Life Beyond Work, started by a pharmacy assistant who later won elected office, was adopted by Lula's party and pushed through the senate. Flávio Bolsonaro's reversal tells the real story of who owns the political ground here. For months he called the proposal a path to "mass unemployment," echoing employers' associations. Then polls showed over 70% public support — and more than half of his own voters backed it. He voted yes remotely while campaigning in the south, but immediately signaled to business leaders that, if elected, he would revisit parts of the amendment. Several allied senators echoed this during the vote. None of the changes take effect before the October 25 runoff. After promulgation, a 60-day window elapses before six-day weeks are abolished and the cap drops to 42 hours, then to 40 hours after a further 14 months. The political payoff, however, is immediate. Researcher Victor Escobar argues the amendment "could indeed benefit Lula's re-election campaign" by shaping how voters feel about their economic prospects at the ballot box — even before they see a single extra day off. The structural question is whether this is a durable labor reform or an electoral device vulnerable to rollback. Bolsonaro's preferred alternative — paying workers by hours actually worked rather than capping the week — would effectively deregulate scheduling, shifting risk to workers while preserving employer flexibility. The Folha report that he privately assured business leaders he'd review the amendment if elected is the clearest signal that the reform's permanence depends on the runoff outcome. Researcher Marilane Oliveira Teixeira at the University of Campinas points to evidence that six-day schedules produce illness, workplace injuries, and exhaustion, with women bearing compounding costs from unpaid domestic work. Lilian Cristo dos Santos, a 50-year-old saleswoman in Salvador with one day off per week, put it simply: "There's no time to go to the doctor, to the beach, to the salon, to look after myself." The amendment is a tangible quality-of-life improvement for workers whose schedules leave almost no margin. Lula's broader pre-runoff strategy is clear: debt relief for microentrepreneurs, a letter courting evangelical Christians who lean Bolsonaro, large-scale demonstrations, and a stronger social-media push. Political scientists describe a race that is "tangled, tied, with some degree of advantage for Bolsonaro" but still open. The 40-hour amendment is the centerpiece — a policy with deep popular support, a grassroots origin, and a ticking clock that forces voters to choose who they trust to protect it.