"a full 24 hours" is correct and can be used in written English.
You can use it when referring to a period of time which is a full day. For example, "I gave myself a full 24 hours to put this project together."
For a full 24 hours starting at 6 a.m.
It had taken a full 24 hours, but I'd made it.
"Thursday's paper will be a full 24 hours later," he said.
By 6pm, some television channels had returned to normal broadcasting after a full 24 hours of military programming.
It is difficult not to laugh aloud at this solitude not yet a full 24 hours' distance from New York.
That is puzzling, Mr. Wagstaffe said, because those records were obtained a full 24 hours before the only witness, Brunilda Capella, emerged.
With advance notice, guests can check in any time, and checkout time is a full 24 hours later, said Phil Baxter, the general manager.
A full 24 hours before the Oscars were distributed, the Razzies (as the awards are known) were inflicted on the season's losers in what was declared to be 'the Worst Moviegoing Year Ever'.
Ministers, in contrast, were reportedly given a full 24 hours to pore over the summary, during which they were free to take advice on how best to spin it.
Not far away, the posh Beverly Hills Peninsula adopted round-the-clock check-in and checkout eight years ago on the notion, outlined on the hotel Web site, that the room "belongs to the guest for a full 24 hours".
Each team races flat-out stints interspersed with furiously quick pit stops, looking to eke out tiny advantages that over a full 24 hours can make the difference between winning and losing.
