Is the remembrance "There is no god but Allah alone, without partner; to Him belongs all sovereignty and all praise, and He is over all things competent" considered an absolute remembrance, not restricted to morning and evening or after prayers, and is the virtue of freeing slaves multiplied by repeating it many times a day?

The remembrance (dhikr) "Lā ilāha illā Allāh, waḥdahu lā sharīka lah, lahu al-mulku wa lahu al-ḥamdu, wa huwa ‘alā kulli shay’in qadīr" (There is no god but Allah, alone, without partner. To Him belongs sovereignty and to Him belongs praise, and He is over all things competent) is permissible to be recited absolutely throughout the day, and is not restricted to morning or evening. Evidence for this is the prophetic hadith which mentions the virtue of saying it one hundred times a day, and the resulting reward and protection from Satan. A group of scholars have utilized this virtue and mentioned it in their books. This remembrance is among the best forms of remembrance.