During the test, you will check the time on the Rolex Daytona every 24 hours. A Rolex accuracy specification for the Rolex Daytona is +2 or -2 seconds variation per day.
If the Rolex Daytona suffered a hard knock or fell on the floor. It is good to do the accuracy multiple times to know if the impact has damaged the Rolex movement in any way.
The Rolex Daytona Needs to Fully Wound for the Accuracy Test.
Start by ensuring that your watch is fully wound and ready. Unwind the crown, then wind your Rolex crown around 40 times.
Use a smartphone or your desktop clock to precisely set the time on the Rolex Daytona.
Start the Rolex Daytona by pushing in the crown and screw it down correctly.
Set the alarm on your smartphone for 24 hours to remind you to check the watch accuracy.
Wear your Rolex Daytona during the day. You can take it off during the night if you usually do it. The power reserve will keep the watch running through the night.
The Rolex Daytona, during the test, needs to be worn on an active wrist for the rotor to keep wind the watch. If you are having a physically inactive day, you can top up the power reserve manually. In the evening, use the Rolex Daytona crown to wind the movement.
After 24 hours, when the alarm sounds, check the time of the Rolex Daytona to see if it has remained accurate.
Rolex Daytona Accuracy Results
Compare the time on your smartphone and the time of the Rolex Daytona.
Within 24 hours, the difference should not exceed 2 seconds faster or slower.
If the time is the same (+2s/-2s), the Rolex Daytona is accurate, and the watch is fine.
If the Rolex Daytona watch has gained or loses more than 2 seconds, then repeat the test once more. If the results remain the same after each test, there may be something wrong with your watch and it should be sent for servicing. A Rolex Cosmograph Daytona Service will test the watch calibration more scientifically and locate the source of the problem.