Typically 12–20 for patterns; fewer if tightly scoped to one role family, more if diverse/global.

You’re interviewing for patterns, not quotes. For a focused scope (one role family or function), you can often see patterns in 8–12 interviews across levels and managers. For a broader EVP, 12–20 is a common range to capture variation (tenure, performance, region, business unit). Add a few “edge cases” (new hires, recent exits if possible, high performers) to stress-test claims. Stop when you’re hearing repetition and can support each pillar with multiple examples and artifacts. The goal is enough truth and proof to ship—then refine based on market response.