992. Commentary: It has been mentioned previously that reciting long surahs in Maghrib was an occasional practice of the Prophet sallallahu alayhi wa sallam. The followers behind you would experience delight and ecstasy, which was an effect of your spirituality. Not every person is like this. We have been commanded to show leniency (takhfif).
Source: Sunan Nasa'i: Translation and Benefits by Shaykh Hafiz Muhammad Amin Hafizullah, Page: 992