If you spend only 3 days or less in Madeira it is not enough time, even 4 days will feel like a jam-packed itinerary. If you're able to go for a week this would be an ideal amount of time and a chance to go off the beaten path.
Is Funchal Madeira worth visiting?
Funchal is worth visiting, due to its location, weather, several events during the year, historical monuments around the city, its culture and museums, world-renowned parks and gardens, amazing viewpoints to watch the sunset, and the nearby beaches and swimming pools.