The ideal number of days in Panama depends on how much of the country you want to see. For a first-time visitor, 5 to 7 days is usually the best balance: enough time to explore Panama City, visit the Panama Canal, walk through Casco Viejo, take a nature day trip, and possibly add a beach or island experience.
If you only have 2 to 3 days, stay focused on Panama City. You can visit the Panama Canal, Casco Viejo, the Amador Causeway, and maybe take a half-day nature trip near the city.
For a richer trip, 7 to 10 days lets you combine Panama City with places like San Blas, Bocas del Toro, Boquete, El Valle de Antón, or the Pacific beaches. Official tourism sources highlight Panama City, Bocas del Toro, Boquete, Tierras Altas, Riviera Pacífica, Pedasí, Portobelo, and other regions as major destinations, which is why a longer stay helps you avoid rushing between very different areas.
If you want a complete Panama experience, plan 10 to 14 days. This gives you time for the capital, Caribbean islands, highland coffee country, nature, beaches, and travel days. Bocas del Toro alone is worth several days because it includes islands, beaches, mangroves, marine parks, and ecotourism activities.