I left the endurance app running for about 6 hours today. Write speeds remained around 6MB/s, which comes out to ~ 500GB of data per day.

I was tempted to leave it running to see if the write speeds would get even slower, but at 6MB's the reponse times made the app unresponsive.

Right now my internet speed (50 Mbps) is as fast as my SSD (6MB/s).