TTY_TIMEOUT

   TTY_TIMEOUT sets the number of seconds before a process
   associated with a disconnected terminal is deleted. The default
   value (900 seconds) is usually adequate. Note that using values
   for TTY_TIMEOUT greater than one year (value %X01E13380) can
   cause overflow errors and result in a disconnected device timing
   out immediately.

   TTY_TIMEOUT is a DYNAMIC parameter.