I am in industrial construction. The permit process varies by county. I was on one job, a bp refinery, the permits took 2 years to approve
This project looks rather simple, with minimal environmental impact in a smaller county.
Based upon those factors, I tend to think that once the permits are submitted, I can see the board acting on the permit within a month. If the permit is approved I lean towards a complete build out in 90 to 120 days.
This is a small project, no more than 10 to 15 men on the job.
Just my thoughts