You should try flac or ape or alac instead of wav format. Wav files have a 4 byte size field in the header that limits them to 4 GB size (or 2 GB in some programs). If someone else knows of a work-around for this, please chime in. The whole 7 hour 42 minute file is probably produced OK, but when it writes the file size to the header, it will be wrong and goof up the duration display in most programs. If the wav file is standard 44,100 hz 16 bit stereo, 4 GB can accommodate up to about 6 hours, 46 minutes.