Nahik bin Sinan said: A man came to Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) and said: I recited the whole of the Mufassal in one rak'ah. He said: Rattling through it hastily like poetry (is that prayer)? I know the surahs of similar length and theme which the Messenger of Allah (peace and blessings be upon him) used to recite combined, twenty surahs in ten rak'ahs.
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 9831