Thanks for clarifying; after giving it another try, I think I understand it better now. This time around I got a lot more out of the upgrades, especially the one that increases selling price. I still didn't notice much of a difference in production time after the first speed upgrade, but the second one I felt the difference almost instantly. I managed to make it to 20 days this run before I accidentally overlooked the whozit's energy deficiency (which tells me I could've theoretically kept going). While the early days still feel a little tight for my liking, I appreciate that I don't feel like I hit my skill cap and can't go any higher, which is how I felt when I first played.