1. An I/O processing system, comprising: an operating system including an electronic hardware processor configured to control an input/output (I/O) device, the I/O device configured to execute an I/O operation in the I/O processing system; and a channel subsystem module in signal communication with the operating system, the channel subsystem module including an electronic hardware processor configured to output an interrogation command signal while the I/O device executes an I/O request, wherein the I/O device returns an I/O status signal directly to the operating system indicating a completion percentage of the I/O request left remaining, and the operating system dynamically determines a timeout event of the I/O request based on the completion percentage of the ongoing I/O request, wherein dynamically determining the timeout event includes comparing the completion percentage to a percentage threshold value, before invoking the timeout event.