Psalms 119:164

“Seven times a day - The word seven may be used here, as it is often in the Scriptures, indefinitely to denote many, or often. There is, however, nothing which makes it necessary to understand it in this sense. The number of times in which it is proper and profitable to engage in secret or public devotion is nowhere specified in the Scriptures, but it is left, under a general direction, to be determined by each one as he shall find it desirable and convenient; as his feelings or his circumstances shall suggest. On another occasion Psalms 55:17 David mentions that he prayed “evening, and morning, and at noon;” at other times, perhaps, he might have found it in accordance with his feelings, or…”

“Seven times - Many times; a certain number being put for an uncertain. Psalms 119:165”

“Seven times: That is, probably many times, or frequently, as the term seven frequently denotes; but Rabbi Solomon says that this is to be understood literally; for they praised God twice in the morning before reading the decalogue, and once after; twice in the evening before the same reading, and twice after; making in the whole seven times. Psa 119:62, Psa 55:17 because: Psa 48:11, Psa 97:8; Rev 19:2 Psalms 119:165”