Reducing the time for buildworld

[shivanth]

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My system has been running 'make -j3 Buildword ' for an eternity now .
Worst -the make buildword causes the kernel to crash after 3-4 hours .
And it seems the make command does not continue from where it stopped
the last time instead it rebuilds the entire tree . Am i doing something
wrong .Is there a config file for buildwprld where i can change this
Thank you
Shivanth