The Dutch have quietly adopted working just a four-day week. But what has been its impact, and can it last?

"Your kids are only young once," says Gavin Arm, co-founder of Amsterdam-based small business Positivity Branding.

"Most people, if they're running a company, they throw themselves into it and work, work, work to try and make it. And they're probably doing it for their kids.

"But then they look back when they're older and go 'I missed that part of their lives', and that's awful. We don't want to be like that."

Arm is speaking to me at the firm's cosy office in the Dutch capital's lively De Pijp neighbourhood. South of the city centre, it is known for its bustling markets, bohemian history and heavy gentrification.