Don't worry too much about it, but your goal is to basically focus on construction sites.

60CS (60 turns)
100Indies (5 turns)
200Farms (10 Turns)

That's a pretty good start (75 turns)

Or you can go even riskier with less production and do 80CS
100 Indies (4 turns)
200 Farms (8 turns)

92 turns total, assuming not theo or dict

Sell bushels for $29 on the private market instantly, and set production to 100% turrets and keep them. Very simply, no need to think.