To what extent are the prayers mentioned in Imam Al-Ghazali's book "Secrets of Prayer and Its Essentials," which are repeated weekly (prayers for the days and nights of the week), authentic, given that they are based on narrations with weak chains of transmission?

The hadiths reported about the virtue of prayers performed on certain days of the week are either very weak or have no basis. Al-Hafiz Al-Iraqi, in his book "Al-Mughni 'an Haml Al-Asfar," clarified that they are "weak, repudiated hadiths, and nothing authentic has been reported concerning the days of the week and their nights."