<human>:  How many years did the Toba eruption last?
<bot>: The Toba eruption is thought to have lasted about 75,000 years. It was the largest eruption of the past two million years, and it is thought to have had a global impact on life on Earth. The Toba eruption is believed to have been the cause of the end of the last ice age, which caused the extinction of the dinosaurs and many other species.