For iX2500/iX2400/iX1600/iX1500/iX1400/iX1300/iX500/S1300i/S1100, scan documents longer than 360 mm (14.17 inch) by pressing the Scan button for three seconds or longer to start scanning.
For iX1300, perform U-turn Scan simply by loading a document with a long page in the ADF paper chute (cover) on the ScanSnap and performing the scan.
About document lengths that can be scanned with the ScanSnap:
ScanSnap Help
(Select the model name of the ScanSnap at the top of the page)