Hojjat al-Islam masihBoroujerdi recalled through one of memoirs that Imam Khomeini, the late founder of the Islamic Republic never let single moment of his time to be wasted.
I personally saw him reciting Quran during moments just before meal was prepared or dinning got ready.
(Glimpses form character and conduct of Imam Khomeini, Vol. 3, PP. 6-7)