How long is the medical evaluation good 719k for?

I am due for my yearly physical but will also be upgrading my license in a few months. I am curious how long the physical is good for? Since I have to do one now should I do the 719 form and be able to use it when it time to upgrade?

12 months. Might as well do it now and submit it for medical review so that any issues that pop up can be sorted out.