My app asked for a Play Store review after someone opened their third company page. I picked 3 because it sounded reasonable. Then I measured 28 days of production events. 56% of signed-in users open exactly one company. 15% open two. Only 29% reach a third. The prompt was firing after a moment 71% never arrive at. Threshold is now 2, plus a second trigger when someone adds to a watchlist. The lesson isn't "use 2". It's that I had a constant I'd never compared against what users do.