Question

The reaction time in a laboratory setting is how many seconds?

Answer 1

I don't know. You haven't specified the reaction.

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Any given reaction can occur for any given number of seconds... or hours. Or days. Maybe even years, or decades...

There are reactions like

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that take about `10` seconds... and you may see syntheses in organic labs that take a few days.

Or... consider that the hydrolysis of a given peptide bond usually takes over `100` years to occur, so even though it is thermodynamically favorable, we don't have to worry about death by hydrolysis. :-D