If you are wearing a quartz (battery powered) watch then the quick answer is no. If you own an automatic or self-winding watch, provided that the movement is fully winded, it will provide your watch between 30 - 40 hours of power or functionality. The normal movement of your wrist while wearing your watch should keep the movement “charged”. However, if you do not wear your watch for a couple of days it may be necessary to wind the movement and give the watch a gentle shake to get it going before putting it back on your wrist.Please refer to your Instruction Manual to learn how to manually wind your watch correctly.