How long does the closure compiler default.js last for?

I just minified a script using this tool and noticed the line "The code may also be accessed at default.js". Here开发者_JS百科's a pic:

How long will this link stay good for? Is it safe for me to use this in my script tags?

To use the optimized code, you can cut and paste it into your source file, download the file into your directory, or link to the file directly in your script tag (for up to one hour).

This is from the help page on the link you posted.