I'm with Rick on this one. I think it is rude for a performer to be seen "watching the clock," or at the very least distracting for the audience. On the other hand, as a performer, under most circumstances you need to be aware of the time. Even when I'm the only one playing that night - I need to be aware of the time to pace the evening.

I don;t bring a watch/clock - and it would make sense if I did (I alway seem to have lots of music paraphenalia (how do you spell that word?) so adding a watch to the capos, picks, harmonicas, glasses of water, etc - would be a good idea. BUT normlly there is a clock within view OR a stage manager with responsibility to keeo you aware of the time.