vphope,
I am not sure how long it takes, if applied seperately. However, my frind who applied for 485, after 140, around third week of Jan 2005, got his GC and plastic cards by April 22, 2005. He had applied for i-140 with substitute labor, which took abt 10+months.
I can say substitute labor I-140 takes longer than regualr I-140. At the same time, there are still lot of guys waiting for the final approval of GC who are waiting for more than two years after applying for 485. Reason being that those cases got to clear FBI name check clearance before final approval.