The queue to see Queen Elizabeth II's coffin is expected to be very long today, Saturday, in front of the Palace of Westminster in London, as her body is lying in bed until the start of her burial on Monday, which will be attended by leaders and kings from all over the world.

The queue to see her coffin last night extended for several kilometers along the Thames, and the government estimated the waiting period at more than 22 hours.

According to public transport officials in London, about 750,000 people may stand in line to see the coffin.

While the government said that the waiting time in the queue of more than 8 kilometers may exceed 24 hours during the weekend.

The Imperial crown and sceptre over the coffin of Queen Elizabeth inside Westminster Hall (Reuters)

The Queen's four sons spent Friday night beside their mother's coffin, as they had done in Edinburgh, and they all stood in uniform, their backs to the casket with their heads bowed, for a quarter of an hour, while crowds were flocking to the Westminster Hall of Parliament.

On this occasion, her son Andrew - who was deprived of most of his military titles after a sex scandal - was allowed to wear the military uniform, and the Queen's eight grandchildren are also supposed to come this evening to bid her farewell, and representatives of the 14 Commonwealth countries are expected to attend on Saturday to take a final look at the Queen's body.

About 750,000 people queue to see Queen Elizabeth's coffin (Reuters)

The Queen's body will be carried on Monday morning as part of a march to Westminster Abbey, where the burial will be held, and it will be the first state funeral since the death of former British Prime Minister Winston Churchill in 1965.

An invitation was extended to two thousand people, including hundreds of world leaders and kings, including: US President Joe Biden, European Commission President Ursula von der Leyen, Japanese Emperor Naruhito and French President Emmanuel Macron.

London police said the funeral would be the largest ever security event, even bigger than the 2012 London Olympics.

Queen Elizabeth II will be buried at St George's Chapel in Windsor Palace in west London, along with her father, King George VI, mother Elizabeth Bowes-Lyon, and her husband, Philip.