aammiitt

I purchased a Rolex datejust from a trusted dealer. Beautiful watch. Very happy with how it looks. (It's the larger of the two datejust sizes; I can't remember which movement t it has, but I paid about $250 a year ago. However if I wind the watch up in the morning, it lasts less than 24 hours. Typically it will stop at night (when there isn't any movement on my wrist). The next morning I need to reset the time and wind it up again. (I've had the watch for a year now, but this has been happening since day 1) Is this normal? How long should I expect the watch to 'last' without having to rewind it? Thanks for your input.