Is there an export limitation on trial version of Cubase?

I just mixed my first tune with trial version. I exported the result, but the file on disk is only 16 seconds long.

Did you set the LR locators to the entire song?

No, was not aware. seems weird, but I will

The Export Audio Mixdown function allows you to mix down and export all audio that is contained between the left and right locators of a project or in ranges defined by cycle markers.