Direct answer
Two days in Coorg (Kodagu) can cover the highlights: coffee estates, Abbey Falls, Raja's Seat, Madikeri Fort, and a short nature/temple visit with time for relaxation.
Suggested 2-day itinerary
Day 1 — Arrival, Madikeri highlights, sunset
Day 2 — Nature, temples, and departure
Logistics & travel tips
Food & local specialties
Safety & etiquette
Quick sample timings (for planning)
If you want, I can tailor this itinerary based on your arrival city, travel dates, accommodation preference, or interests (trekking, wildlife, food).