If the clutch is slipping, then you can make it last for ages if you need to, just by matching engine speeds before using the clutch (except for 1st gear from a standing start, of course), and by using less power so it doesn't slip. Once it begins slipping, it heats up and the slip continues, so you have to ease off the pedal.
My original Bluebird had a slipping clutch, for about 2 years, but once it started, it never got any worse, due to my change in driving style
The danger of prolonging the lifespan of a worn clutch is that you can damage the flywheel, especially if the clutch fails suddenly at the end.
__________________ Team GasMisers5 - #1 for first three rounds of the original GS Fuel Economy Challenge
Miles displaced by e-bike since 1 Jan 2008: 62.6 (0 kWh used)
Yesterday I had to do a 180 on the highway (my wife forgot something), and noticed when I goosed it pretty good to get up to cruising speed, the tach jumped about 500 RPM for just a second. So it may be the clutch....anyway I've got a guy that's going to look at the brakes next week, will have him check the clutch out as well.