How many years does it take a tombolo to form?

The formation of a tombolo can take several years to centuries, depending on various environmental factors such as sediment supply, wave action, and local geological conditions. Typically, it begins as sand accumulates in shallow waters, gradually connecting an island to the mainland. The process is influenced by factors like coastal currents and tidal patterns, which can either accelerate or slow down the formation. Overall, the timeline varies widely based on specific circumstances.