At Federal Express, prior to fiscal year 1986, the average GFTP heard by an Appeals Board (the last step) took 75 days.
To speed it up, they emphasized that if one is involved in a GFTP, a meeting must be scheduled ASAP -- If additional time is required to investigate the facts, make sure enough time is allowed to acquire information in a timely manner.
The Federal Express survey/feedback/action program, which complements their GFTP and other communication tools, is an annual survey of employee attitudes.