AviaNZ supports audio files of any size because it works on pages (sections). E.g. when you open a long recording in AviaNZ it opens the first 5 min by default, however you can change the page size. Refer Interface Settings in the Manual.
It's normal that the title bar of the window updates to 'AviaNZ - Batch Processing (Not Responding)' during the time that the program automatically finds the target sounds in a batch of recordings, still the program is doing all the computations and you can see some updates on the console (black window). It takes a long time to finish the batch process depending on how big the batch.
The reviewed work will be saved. The excels will get updated with both reviewed and non-reviewed segments.
Currently no. If the segment is much longer than the target call, we recommend marking it as "Don't Know" and opening it in manual mode later - this way, you can edit its borders to match the actual call.