I don't have a clock in my sewing studio, but if I need to do something besides sew at a specific time I just set myself a timer on my phone. Otherwise when I'm in there I figure if I've found time to be in there I don't need to worry about how long I'm in there. I do, however, need to take breaks occasionally so I look at a clock when I come out to get a snack or use the potty. And if I don't have anything I need to do besides make dinner I set a timer for that as well. Though I have been thinking it'd be fun to have a Dresden plate clock in there! So maybe one day I will have one?