How much asbestos exposure to get mesothelioma?

How much exposure does it take to get the disease mesothelioma? What is the latency period?

Very little exposure can result in mesothelioma. Sometimes people who worked with asbestos for as little as one or two months get mesothelioma. The "latency period" refers to the time between asbestos exposure and diagnosis of the disease. For mesothelioma, the latency period can be decades long, and people exposed in the 1940s, 50s, 60s, and 70s are now being diagnosed.

[mesotheliomaweb.org]