Greetings
I gotta go with the flow here, there is nothing that says that corrective actions cannot take months to finish. My advice to you is to be very thorough in you CA system when you schedule corrective actions.
Point one: do not confuse corrective actions with root cause analysis or managing problems, nonconformances. I have found that a lot of people don't fully understand the whole process. I think that ISO would do the world a service if they talked about problem/issue management instead of corrective and preventive actions.
Point two: If a corrective action is truly needed, make sure you are specific in scheduling and assigning activities. Don't say "Joe will fix it" Each step should be assigned and scheduled. 1) purchasing agent will issue a PO for the Whatchamaycallit. Lead time is 3 weeks. Delivery due on 7/31/02. 2) Whatchamaycallit will be set up by maintenance. Task time is 1 week. Action due date is 8/7/02. 3) Newly installed Whatchamaycallit will be trialed, and operators trained. Equipment and process capabilities will be assessed. Training will take approximately 3 weeks and will be done at the same time the equipment is trialed. Capability assessments will take aproximately 3 more weeks. Action due date is 9/30/02.
If you set up each action and follow up on it soon after the due date, you will be able to adjust schedules for any unforeseen problems. (like the barge that ran aground last nite

)
Not only have you provided evidence of corrective and/or preventive actions, but you can also use these as part of the quality planning process when applicable. I have been involved in corrective actions that took 2 years to complete. Of course there were many interim actions that were taken to minimize risk until new lines could be purchased, fabricated and installed. Just make sure you can show you have a schedule, you are on top of it, and making progress!
Good luck!