The hopeful palace visitor was assigned the number 6,542.
Their webpage said the number of users queueing ahead of them was 3,063.
At 7.17pm, a message stating the queue had been paused was released.
It read: “Sorry, we’ve had to pause the queue due to exceptional demand.
“We will serve you as soon as possible.”
This morning, royal fans trying to book still had to queue, likely due to the overwhelming interest by the public in a visit to the palace.
Shortly after 9am, a user who tried to book a visit to Buckingham Palace Gardens was assigned the number 36,659 and was told there were 5,898 people ahead of them.
A message issued to people queuing this morning at 7.29 read: “We’ve been overwhelmed with interest in our Buckingham Palace tickets today.
“Please bear with us while we try to serve you.
“Queue times are long, but tickets are still available.”
A third person who tried to book tickets this morning at approximately 7.44 also faced a one-hour waiting time.
They received the number 31,784 and had 2,488 people ahead of them.
However, despite the long wait, people appear to be managing to book their tickets.
One Twitter user wrote: “Booked to have a picnic at the Buckingham palace Gardens in August, who do I think I am”.
Express.co.uk has contacted the RCT for comment.
The Trust announced yesterday it is reopening Buckingham Palace Gardens for guided tours on April 17 – which will allow visitors to see the blossoming surroundings of the Queen’s working residence in London at a time it is usually not open to tourists.
The RCT’s website explained: “You will be given special access to the whole 39-acre grounds in springtime, when the garden is at its fullest, with its meadows carpeted with primroses and bluebells, and its flowering camellias, magnolias and azaleas overflowing with blossoms.”
The State Rooms are also to reopen for guided tours held on weekends between May 21 and June.
Among the areas included on the tour, there are the Ballroom, Green Drawing Room, Throne Room, White Drawing Room, Music Room, Blue Drawing Room, East Gallery and Bow Room.
And from July until mid-September, visitors will be allowed into Buckingham Palace Garden without a guided tour and will be able to enjoy “unprecedented freedom”.
The RCT website read: “Explore Buckingham Palace Garden with unprecedented freedom this summer, and discover for yourself for the very first time its sights before enjoying a unique, once-in-a-lifetime opportunity to picnic with views of the Palace.
“You will be free to wander around the garden’s winding paths at your own pace and experience the beauty and calm of this walled oasis in central London.
“Among the many features to discover are the 156-metre Herbaceous Border, the Horse Chestnut Avenue, the Plane trees planted by Queen Victoria and Prince Albert, and the famous lake with its island that is home to the Buckingham Palace bees.”