Is "Subhan Allah wa bihamdihi" to be said one hundred times during the day and one hundred times during the night? And is forgiveness for whoever says it on a single day, or is it necessary to repeat it every day?

Whoever says "Subhan Allah wa bihamdihi" (Glorified is Allah and praised is He) one hundred times in a day, his sins will be forgiven, even if they are like the foam of the sea. It can be said separately or together, and it is best to gather them at the beginning of the day. It is best to repeat it every day.