In summary, the relative refractory period is a time in which the neuron can fire an action potential, but it needs a greater stimulus. During an action potential, voltage-gated sodium channels open to let in positive ions - sodium. These depolarize the cell.
On average, reciting five Mysteries of the Rosary typically takes about 15-20 minutes depending on whether the optional prayers are also recited. Additionally, some people may take longer than 20 minutes if they decide to devote extra time for reflection and meditation on any of the Mysteries.
Monday through Friday (see prayer guide schedule below). This method took me through the entire Valley of Vision in 13 weeks, only repeating two prayers once each. The arrangement is not arbitrary. The Valley of Vision is organized thematically collecting prayers that share similar themes in each section.