Bootup from offical Knoppix 3.6 CD, using the remastering scripts .16 from Fabian. Decompress CD to HD and then immediately create compressed fs:
On a Dell Optiplex GX1 P3-450MHz 384 MB RAM ~1hour 10minutes
On a AMD Duron 1.6GHz 384 MB RAM ~25 minutes
One a dual proc AMD Opteron 248 1.4GHz 1 GB RAM ~ 15 minutes