Singaporeans hoping for a glimpse of long-time leader Lee Kuan Yew's coffin are being urged to stay away from the sprawling queue as waiting times reach 10 hours.

The government said Friday that it "strongly advises" the public not to join the queue and to instead visit community tribute sites set up across the island.

Lee's death at age 91 on Monday has been met with an outpouring of grief in Singapore. Lee was Singapore's prime minister for 31 years, ruling with an iron grip until 1990 and is regarded by Singaporeans as the architect of the country's economic success.

As of late morning Friday, some 230,000 people had viewed Lee's coffin at Parliament House, the government said. The queue of several kilometres starts at the Padang, an open field in Singapore's downtown, crosses a park and snakes along the Singapore River to Parliament House.

Dozens of tents have been erected in the Padang to shelter mourners from the tropical sun and government workers handed out water to people in the long lines.

"I'm not afraid to wait," said 44-year-old Idy Leong. "Even waiting for 8 hours, I'll still want to wait. Ten hours, I'll also want to wait," she said.

Though credited with building the foundations of Singapore's current prosperity, Lee's legacy also includes a muzzled press, restrictions on free speech and a stunted democracy.

A slew of foreign leaders and dignitaries are expected at Lee's funeral on Sunday including Japan's Prime Minister Shinzo Abe and former President Bill Clinton.

The cortege will take a 15-kilometre journey around key landmarks in the city before reaching the National University of Singapore for the funeral service.

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Yves Dam Van contributed