Girard Perregaux Gyromatic, 1960s… does it need to be wound regularly?

Hi,
I have my grandfathers’s Gyromatic watch which I believe is from the 1960s. 39 jewels.
This is the only vintage watch I own. If I wind the stem, and then wear it on my wrist, it runs for about 5 days before slowing down and stopping. Am I supposed wind it occasionally, or should the Gyromatic function keep it running longer than that?

Thank you for your help.