i have not yet replaced them on my car , so i have no ifno for you , iam sure some of the guys will be able to shed some light on the subject , and were you could take your car. Where are you situated?
even if it has 1mm left you can still go to Durbs and come back !
the handbrake shoes last a very long time - plus with freeway driving for 4 hours you won't be using them as they only work when you use the handbrake .
don't forget to check the discs - probably will need replacing with the shoe as they are normally replaced together .:slap: