Four days to begin, five days to repeat
You want five rounds from eight Beans plants, with some flexibility over when to sow. A Spring 1 start uses four growth days to reach Spring 5, then five-day regrowth gives Spring 10, 15, 20 and 25. Five rounds fit before day 28. The next repeat would reach 30 and is excluded.
This is a useful counterexample to the idea that regrowth must be quicker than initial growth. Here the repeat gap is longer. If you reused the four-day initial number for every step, you would invent extra appointments that do not follow the crop record. If you used five for the first wait, you would start the whole sequence a day late.
Count backward from the last round
The Spring 1 schedule finishes on 25, with three days left in the season. Try moving the start to Spring 4: the first date is 8, followed by 13, 18, 23 and 28. That still allows five rounds. Move the start again to Spring 5, and the dates become 9, 14, 19 and 24. A fifth date would be 29.
If five rounds matter, sow by Spring 4: the three days after the original final harvest let you delay that much while keeping the count. If four rounds suffice, Spring 5 remains an option with a later first date. This flexibility belongs to this Beans sequence; it is not an allowance for every crop.
Make the return visits visible
For a bed you intend to keep, the repeat dates are practical appointments. Plan around 5, 10, 15, 20 and 25 instead of remembering only that Beans are a four-day crop. The schedule assumes daily watering, no fertilizer, buffs or Myco, and harvesting when each round is ready. A missed appointment should prompt a fresh look at your real field.
Eight is the number of plants sharing those appointments. It does not make the crop grow faster, and five rounds do not by themselves establish forty produce items. Use the example to understand the rhythm first. Then choose a bed size that fits your own seeds, space and plans without treating the calculator as a yield or profit model.
The example, calculated
Beans · Spring 1
8 plants. First harvest: 1 + 4 = day 5. Add 5 days for each repeat.
Spring 5 · Spring 10 · Spring 15 · Spring 20 · Spring 25