As long as any extra hour spent on thinking how to design/make/calculate a part reduces build time by an hour; keep thinking if you're good at it.
I do this at work all the time (project manager/engineer) and often get ridiculed by it by production guys. For a few recent big, complex production runs I gave them the drawings and let them make the first part. Big, heavy stuff, glueing, logistics etc involved and time pressure is on (cure time).
I spent a day or two, half an hour each, just mentally going through the production process, made a list, came up with some ideas, planned it etc. Their first run took them 7 man-hours. I briefed them on my exact order, gave everybody a task and the next run took 4 man-hours. Final runs (50 batches later) took 2.5 man-hours.
Probably more pertinent for design, notably in composites. But simply thinking how to avoid one mold can save you a few full work-days.