Twenty-Three Minutes (Recovery Time)

Twenty-three minutes and fifteen seconds is the empirically measured time it takes, on average, for a knowledge worker to return to a task after an interruption and regain the level of performance that characterized work before the disruption. The finding, from Gloria Mark's naturalistic studies of office workers, documents not just the resumption lag but the cognitive reassembly cost: the interrupted worker must reconstruct context, reconfigure executive control, and restore emotional engagement. The consistency of the interval across contexts and individuals suggests it reflects fundamental properties of cognitive architecture rather than individual differences in concentration ability. For AI-augmented builders who are interrupted multiple times per day for monitoring, the aggregate recovery cost alone — 23 minutes × number of interruptions — can consume a substantial fraction of the working day, even before accounting for the attention residue effects that degrade each evaluation.