To train your capacity for concentration, use an intense 2 to 3-hour block work method with a timer, imposing a 10-minute penalty on yourself each time your attention drifts.

noli's read

The idea that concentration is a plastic capacity that can be strengthened through deliberate effort is supported by cognitive neuroscience, notably through the concept of attentional control (studies on neuroplasticity, e.g., the work of Michael Posner). Research validates that task training improves perseverance, although the application of a punitive 'penalty' is a specific behavioral approach rather than a universal scientific consensus. Meta-analyses on mindfulness meditation and Deep Work confirm that gradually increasing the duration of concentration is effective for strengthening the brain's focus circuits. However, the requirement of 2 to 3 hours without interruption is ambitious, as the literature instead suggests 90-minute ultradian cycles as the optimal limit for sustained mental effort. The 'training like a muscle' aspect is a useful metaphor, but actual cognitive fatigue often requires micro-breaks to maintain performance, contrary to the strict rule of only one bathroom break.

the sources

1. 1Ariga A, Lleras A. 2011
2. 2Ericsson KA, Krampe RT, Tesch-Romer C. 1993