To provide an accurate answer, I need to know which volcano you are referring to. Different volcanic eruptions have varying impacts and durations. If you can specify the volcano and eruption event, I can provide information on the havoc it has caused.

In general, volcanic eruptions can cause a range of problems, including:

• Ashfall: Disruption of air travel, damage to infrastructure, and health problems.
• Lava flows: Destruction of property and alteration of landscapes.
• Pyroclastic flows: Fast-moving currents of hot gas and volcanic matter that can cause widespread devastation.
• Lahars: Mudflows of volcanic ash and debris that can bury or destroy anything in their path.
• Volcanic gases: Release of toxic gases that can be harmful to humans, animals, and vegetation.
• Tsunamis: Volcanic eruptions near or in the ocean can trigger tsunamis.
• Climate change: Large eruptions can release gases and particles into the atmosphere, potentially affecting global climate.

Once you specify the volcano, I can detail the specific types of havoc it has created.