My particular case.
I changed the mode of my USB AudioBox to "Secure" (before it was in "Standard") and the block size in Studio One Artist increased to 800 samples.
With this setup I recorded 1 hour and 15 minutes.
Try to change the mode of your interface with the Universal Control.
My HDD is an internal Seagate Samsung 5400 RPM SATA III, 6Gb/s