A 2032 countdown clock was unveiled on Thursday with just one major construction contract awarded since Brisbane was named host five years ago.
The Queensland government warned there was no time to waste to deliver infrastructure, saying the countdown to the Olympic flame being lit on July 23, 2032 was "going to go quick".
But 2032 boss Andrew Liveris insisted it is not "six minutes to midnight" for organisers after meeting with the Olympic president.
Much work is still to be done with seven new venues to be constructed and another 10 to be upgraded before the Games.
One major contract has been awarded, with early work starting on the controversial 63,000-seat main stadium at inner city Victoria Park.
"We have no time to waste now," Queensland Deputy Premier Jarrod Bleijie said at the clock unveiling.
"We've got to deliver the infrastructure, the venues, the road, the rail, the transportation."
Mr Liveris once said construction timelines kept him up at night.
But the Brisbane boss said he was sleeping better now after unveiling the countdown clock in Brisbane's CBD in what he called a "goosebump moment".
"I think six years is perfectly fine," he said of the timeline.
Mr Liveris returned from New York, where he met with the International Olympics Committee president Kirsty Coventry.
"We had a long conversation about timelines, venues, sports and we're confident it's not six minutes to midnight."
The former Dow Chemical chief executive used his extensive business contacts as he looked to secure sponsorship deals to help pay for the multibillion-dollar global event.
"My personal network helps. I just did an event in New York last week," said Mr Liveris, who oversees the $4.9 billion operating budget.
"I've got potential US sponsors coming and joining us.Â
"We're going to need about 50 sponsors all up."
He has secured the Commonwealth Bank as a founding Games sponsor in a deal reportedly worth at least $200 million.
The operating budget is separate from the $7.1 billion infrastructure budget co-funded by the Queensland and federal governments.
The state government insisted the venue plan was on track after revealing renders for the National Aquatic Centre, revamping the heritage listed Centenary Pool in inner Brisbane.
ARM Architecture and NH Architecture, in partnership with Queensland's Arkhefield, will design the venue which will double as a high-performance base for Australia's future stars post-Games.
The Games Independent Infrastructure Construction Authority has shortlisted four contractors for the job with a final builder locked in by early 2027.
Olympic swimming champion Emma McKeon said the 25,000-seat aquatic centre would be a fitting tribute to Australia's history of swimming supremacy.
"In a stadium you want to have a great atmosphere when you're racing - huge crowds, loud crowds, which Australia will definitely bring," she said.
The six-year countdown was also celebrated on the Sunshine Coast with a replica of the 1982 Brisbane Commonwealth Games mascot - towering kangaroo Matilda.
The latest version stands at nine metres near future Olympic venue Moreton Bay Indoor Sports Centre and is affectionately known as Milly.
But not everyone was celebrating the landmark day.
A rally was held outside Queensland parliament over the $20 billion protesters claimed would be wasted on the Games amid uproar over the main stadium proposed for Victoria Park.
"Twenty billion is crazy money and trashing a park that is highly significant to Aboriginal people, to me that's disgusting," local Greens councillor Seal Chong Wah said.
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