Ten minutes of Spanish a day beats four hours once a month, and everyone knows it, and almost nobody applies the same logic to their own mood.
Daily is the operative part. A choice made once is a mood. Made every morning for six weeks, it becomes the default shape of your attention, until noticing something good stops requiring effort. The days it is hardest to do are the days it counts double — not because you will feel transformed, but because the practice comes through the bad week intact.
Nobody is asking for transformation. Just the ten minutes, again tomorrow.