Two million people have signed up for tickets for the London 2012 Olympics, chief executive Paul Deighton said.
Organisers are steeling themselves for the "mind-boggling" task of masterminding the ticket sales, as well as planning and managing seats for the 8.8 million tickets, which are vital to raising £2 billion from the private sector to stage the Games.
The London 2012 organisation needs to get 25% of its revenue from ticket sales.
The 6.6 million tickets for the public go on sale in March and, according to Deighton: "The sheer scale of this is mind-blowing. Just the operational stuff is mind-blowing."
The real pressure will come when the application system goes live in what London 2012 chairman Lord Coe has described as the "daddy of all ticketing strategies".
Mr Deighton said: "One of the key things for us in March is to make sure that things go smoothly. Making sure that everyone understands there is no advantage in submitting applications on the day. With two million people (on the database now), and probably nearer 2.5 million by March, it is also about making sure they are transferred into the ticketing system.
"It is a year of extraordinary demands in getting ready for the Games and in terms of operational delivery."
London 2012's ticket strategy, dubbed the "fans in front plan", is to have full stadia of screaming fans as "it works for the athletes, it works for television and the atmosphere", Mr Deighton said.
Data from the two million registered people so far shows that "by and large more females than males" have signed up and many are opting to try to see several events.
Tickets for an Olympic event start at £20 and end at £725 for the showpiece 100m athletics final. To be at the opening ceremony will cost £2,012 a ticket.