Just for fun, I thought I'd post my output from `time make -j4 buildworld' and `time make -j4 buildkernel' and see if anyone else had any good times.
The machine is an Intel Core2Duo 2.2GHz with 2048MB DDR3.
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>>> Kernel build for ORION completed on Mon Apr 6 12:01:04 EDT 2009
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903.430u 76.701s 16:30.89 98.9% 6007+1017k 7782+8087io 390pf+0w
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>>> World build completed on Mon Apr 6 12:31:44 EDT 2009
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2873.338u 307.173s 28:49.56 183.8% 6175+1028k 23212+10465io 2251pf+0w