Al-Hizb al-A'zam (or The Supreme Daily Dhikr), is a litany by the great scholar Mulla 'Ali al-Qari, in which he gathered hundreds of comprehensive supplications from the ahadith.
Mullah Ali Qari has said in this preface that if you read this compilation daily, it is very good. If that is not possible, then it should be read weekly, or monthly, or even once a year; and if even that is not possible then at least once in a lifetime.