Swedes looking forward to a six-hour workday just got some bad news: the costs outweigh the benefits.

That’s according to the preliminary results of a two-year experiment carried out in the Swedish city of Gothenburg, the home of Volvo. Working hours were shortened to 6 for the 68 nurses at the Svartedalen old people’s home, who got to keep the same salary level. To cover for the reduction, the city had to hire 17 extra staff at a cost of about 12 million kronor ($1.3 million) for the duration of the project.

The study showed that employees at Svartedalen residential home felt healthier, which reduced sick-leave absence, and that patient care improved. But the city won’t make the plan permanent.

“It’s associated with higher costs, absolutely,” said Daniel Bernmar, a local left-wing politician responsible for running the municipality’s elderly care. “It’s far too expensive to carry out a general shortening of working hours within a reasonable time frame.”

It is just the latest in a series of shorter working day trials carried out in Sweden, a country that prides itself on its generous welfare state. The trial has been closely watched globally, with labor activists touting progressive Sweden as a role model in shortening working hours.

The debate is taking center stage in France, where Conservative presidential candidate Francois Fillon has vowed to scrap the 35-hour workweek, which he says has “done a lot of damage.”

While historical data shows that the length of average working days has fallen in Sweden over the past century, there are currently no plans to establish six-hour working days at a national level.

Still, the added hiring by the municipality has helped the coffers of the national government by reducing unemployment costs by 4.7 million kronor during the first 18 months of the trial because of new jobs, according to the interim report.

Bernmar said he’d like to see more studies into whether an abbreviated working day could also result in long-term gains for society as a whole. One argument is that it could allow people employed in labor-intensive professions to extend their working life.

“I personally believe in shorter working hours as a long-term solution,” he said. “The richer we become, the more we need to take advantage of that wealth in other ways than through a newer car or higher consumption.”