Waves Tune can process up to 10 minutes of audio.
Here is how you can process files longer than 10 minutes:
Scan the first ten minutes of your file.

Make your Waves Tune settings.

Process the first 10 minutes by either bouncing or processing offline.

Set your audio host cursor to the 10 minute position.

On top right corner of Waves Tune, click the small triangle and choose 'Acquire Session Start Time from Timeline'.

Waves Tune will now refer to your cursor position as the start point.

The next 10 minutes of audio are now available for processing.
If you do not wish to process the first 10 minutes of your file (Step 3), cut your audio file into 2 files and drag the second half to a separate track, keeping the same timeline position. Then, insert Waves Tune on both tracks, and proceed with steps 4-7 on your second track.