I'm a bearded old guy without a metronome far from Carmel, and often make do with a quartz clock that ticks once a second. That's really handy when dodging and burning. It even has a dial, great for longer times. An electronic kitchen timer is convenient for developing film in trays. Counting seconds is a useful tool for the complete photographer in the field as well as in the darkroom. It can tell one how fast a thunderstorm is approaching. I've heard that Arturo Toscanini know within a second or two how long the music he was conducting would be, and he wasn't even a photographer!