Expiration time for unpainted exterior primer

I sanded and primed my detached garage with the brand Bulls Eye 1-2-3 Primer(4 gallons) about a month ago and I had planned to follow up with the top coat right away but between rain and unusually cold temps at night, I was not able to paint it yet. Has anyone had issues with primer being left on too long without a top coat? I may have to wait until spring now, so will I have to reapply another entire coat of primer or do anything before painting? I did email Rust-oleum who makes that particular primer, and they replied with "if you have to wait until spring, just look closely for any areas that might be compromised or flaking/peeling and recoat those areas" so apparently they feel the existing primer will be fine to paint over. Thanks for any insight.

 

Most primer manufactures state the prime should be painted over within 30 days but I have gone further occasionally. When you get ready to paint - check the primer. If it's chalky or peeling you'll need to sand and reprime. Primer will also get dirtier than paint but that shouldn't be a big issue.