I mean, if you religiously bonus building costs it is still efficient to farm and build your land as casher until pretty deep in the set. It stops being true for a casher much sooner than an FFO, but theres at least a solid 6 weeks of farming and building as much land as you can to max that strat.

I've gone to a billion nw by building them to 400k ish a few times while bonusing building costs. It is the way.

In some cases it became inefficient to build about 2 weeks from the end....in other cases maybe 11 or 12 days, farming was still worth the jets until maybe 9 or 10 days left.