If you want an uncompressed export format for 7 hours plus of stereo recording, you can use RF64 which has a limit of about 16 exabytes (that is, no practical limit).
Choose “Other uncompressed files” when you export, click the “Options…” button, choose “RF64 (RIFF64)” Header and choose the bit depth in “Encoding”. If you choose 16-bit encoding and 44100 Hz project rate it will use 600 MB of space per hour for stereo or 300 MB per hour for mono, just like WAV (Microsoft) 16-bit PCM.
However Windows Media Player won’t play RF64. VLC and Foobar2000 will.
Gale