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@Paul > If I approximate the size of 275 WAV files at 5 minutes each to be 51MB per file, that's 13.7GB. USB2.0's maximum transfer rate is 40MB/s (which rarely operates at full speed, but let's just say it does), so you're looking at 6 minutes to write that data AT FULL SPEED with no headers or stopping to update the file table.
Now, we're not just dealing with one single 13.7GB file, it's 275 audio files, plus 275 waveform data files, plus 275 album artwork files, etc... and those tiny files can take almost the same amount of time to transfer as one much larger file due to the nature of the process.
Using a SSD on USB2 is like putting a NASCAR in freeway traffic; it's great that you have a fantastic top speed, but you're not going anywhere with all the other cars in your way.
If you want to improve the export time, use a USB3 port. If you don't have one, get an add-in card or an adapter if your computer will support one. Otherwise, sorry, you're stuck waiting.