Brazil’s Senate has approved a constitutional amendment that will gradually reduce the maximum workweek to 40 hours, a move expected to affect more than 30 million workers and boost President Luiz Inacio Lula da Silva ahead of the Oct. 25 presidential runoff.

The amendment, approved Wednesday by 75 senators, will gradually reduce working hours and abolish the six-day workweek currently followed by 16 million people.

Only one senator, former Vice President Hamilton Mourao, voted against the measure.

Lula has strongly backed the reform as he seeks to challenge his rival, far-right Sen. Flavio Bolsonaro, son of former President Jair Bolsonaro, who secured a first-round lead.

“Ending the 6×1 schedule is about more than changing working hours,” Lula wrote on US social media company X after the vote. “It means more time to live, rest, be with family, watch your children grow up, look after yourself and enjoy life.”

The initiative originated in a social media campaign called “Life Beyond Work,” launched on TikTok by a pharmacy assistant.

It gained momentum before Lula and his party adopted the proposal and pushed for its approval in Congress.

The younger Bolsonaro, who had opposed the reform for months, changed his position on Tuesday, saying most Brazilian workers supported the measure. Earlier, Bolsonaro had warned that reducing working hours could lead to mass unemployment.

The reform passed the lower house in May but remained uncertain in the Senate, particularly after conservative forces strengthened their congressional position in recent elections.

Despite the approval, the changes will not take effect before the presidential runoff.

Once the Senate president formally promulgates the amendment, it will allow 60 days before six-day workweeks are abolished and the maximum workweek falls from 44 to 42 hours.

The limit will then decline to 40 hours after an additional 14 months.