Is there a vacancy clause in an HO 3 form for for coverage A and C?

If so, is there a limited number of days that coverage is provided for?

I'm sorry, but this is a policy specific question since the vacancy clause is an endorsement (addition) to your policy to add further coverage. You'll need to contact your insurance company for the specific answer. Hopefully, some of the following resources can help:

• Insurance for vacant homes
• Builder's Risk Insurance
• HO-3