A la menor oportunidad

A la menor oportunidad
 

How can I say, Hablais a la menor oportunidad, meaning that when students have the minimun chance, because there is a second of silence, they start chatting.

at the first opportunity

Thank you. Can you make a sentence in context.?
You speak at the first opportunity you get.???
In Spanish we would say" Aprovechais la mínima oportunidad para hablar"
In English?

Your sentence makes sense.

Much depends on what you mean to say. Your sentence is neutral.
Speak up at the earliest opportunity. (imperitive)
You start blabbing at the your first opourtunity (despective)
etc

They start talking at the drop of a hat