Answer:
We can't predict the next Long Valley Caldera eruption with any certainty. The last eruption in this region was around 1800, and in the past eruptions have happened every 500 years on average. The Long Valley caldera experiences earthquake swarms, ground deformation, and carbon dioxide gas emissions, which are carefully monitored by the USGS' Long Valley Volcano Observatory. However, unrest of this type can last for decades or even centuries without leading to an eruption.