Cups of chai sold daily at a major railway station
Footfall × conversion — with dwell time as the hidden multiplier.
Estimate daily chai sales (cups) at a major junction station (~3.5 lakh daily passengers). Footfall builds need two refinements beginners skip: who is in the footfall (long-distance vs suburban), and how long they wait — dwell time drives consumption.
Segment footfall
3.5L passengers: ~40% long-distance (waiting, families, tea ritual), ~60% suburban (sprinting for the 8:42 local). Add ~80K accompaniers/staff/vendors.
Long-distance
1.4L × 45% buyers × 1.3 cups ≈ ~80K cups — dwell time converts to consumption.
Suburban
2.1L × ~7% ≈ ~15K cups — conversion collapses when dwell is minutes.
Others
80K accompaniers/staff at ~10% ≈ ~8K cups.
Total
≈ 1 lakh cups/day (≈ ₹15 lakh at ₹15/cup, across ~60–80 stalls ≈ 1,300 cups/stall — plausible).
How to defend it
The segmentation by dwell time is the answer's skeleton — say it first. The per-stall sanity check (1,300–1,500 cups ≈ one cup every 40 seconds over 16 hours, across 2–3 servers) closes the loop physically.