The title promises an open schedule, a stretch of empty time with nothing demanding the speaker's attention. But the poem quickly shows that freedom is not the same as being untouched by time. The speaker's "clock" is "the only tune," so with no appointments or noise to fill the hours, the steady ticking becomes the one sound left. Time is no longer background; it's the whole song.
The last three lines turn this into something close to a rule: "Nothing passes without time." Days need it to go by, and so does wine, which makes the choice of example interesting. Wine suggests something that takes time to ripen and to be enjoyed slowly. The speaker seems to accept that pleasure and ordinary life both depend on the same passing minutes.
The mood is quiet, still, and a little wistful. It feels like sitting alone in an empty afternoon, listening, and noticing how much the clock is doing.