Yes, the number and skill of your builders does affect the time. I know that it seems to take forever, but the wait is definitely worth it. ;\)
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PowerPC G5/1.9 GHz/OS X 10.5.2/1 GB RAM/128 MB VRAM
iBook PowerPC G4/1.33GHz/OS X 10.4.11/768 MB RAM/32 MB VRAM