"instant opening" is correct and usable in written English.
It is an idiomatic phrase that means something is available quickly and immediately. For example: Thanks to the instant opening feature, I was able to open the package in a matter of seconds.
Instant opens Friday 27 September at Good As Gold in Wellington.
Failure to pay attention for just an instant may open the way for infection.
In the very instant she opens her mouth to say "Hi," startling them both, she realizes what it is: a turtle.
MOBS of diners descended on Catfish Max in the old Harbor Marina in Seaford almost the instant it opened in November.
Equus, which has been praised almost from the instant it opened five years ago, was voted the seventh most popular spot in the area, moving up from No. 14 last year.
Sometimes he believed that he was in direct communication with the Almighty ("For an instant God opens his door and His orchestra plays the Fifth Symphony," he wrote in a letter) and sometimes he felt worthless.
The romantic comedy of our bromance bloomed the instant Robert opened his gorgeous portfolio, mind and body for me when I was editor of Drummer, a San Francisco magazine targeted at gay men with an interest in leather.
The instant someone opens an e-mail message that contains instructions to display a graphic file, his or her computer automatically fetches the image from a specified location on the Internet.
"He was embedded there in Panama, so he just fell naturally into it, caught the magical side and produced a novel that, through criticism by caricature, is the essence of 'the dictator has no clothes.' " Yet Mr. Koster, 79, is a pure product of New York, as becomes clear the instant he opens his mouth.
But though both formats let you bookmark your favorite scenes easily, only HD-DVD remembers them after you remove the disc from the drive; with Blu-ray they disappear the instant you open the tray.
