minimal time to effect or response

https://doi.org/10.1351/goldbook.14858
Minimum time required to get an effect or response. Regardless of the toxicant concentration, the effect, or response, cannot occur any faster than this minimum time.
Source:
PAC, 2009, 81, 829. (Glossary of terms used in ecotoxicology (IUPAC Recommendations 2009)) on page 916 [Terms] [Paper]