lifespans and volcanos

The average ant lives for approximately 90 days. By my reckoning that makes a 4 hour picnic last about 0.18% of an ant's life. If you take the average human lifespan of 75 years and calculate the same percentage you come to around 49 days... by that reckoning, if the Volcano is to humans what a picnic is to ants, it should be safe to fly over Europe again by June 3rd