Size limits for WAV and AIFF files

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WAV and AIFF files are limited to a maximum size of 4GB, see the following table for how this translates to time durations

Approximate maximum time durations for WAV and AIFF PCM-encoded files

Maximum sizes for files in time duration (hours:minutes)

Sample Format	Stereo	Mono
16-bit (default)	6h:45m	13h:31m
24-bit	4h:30m	9h:01m
32-bit	3h:22m	6h:45m

These timings are the theoretical maximum times. You would be well-advised to restrict yourself to slightly lower limits to afford some head-room.