Part of my new job is to fetch permits from Maryland, DC, Virginia and DE. I've gotten some in minuets and others take months depending on comprehensive sign plans or historic conform-ability. Most take a few weeks. Each muni is different and with in each office there are some people who can get it done and other miserable government sloths who hate their job and punish the companies by unneeded delays. Fees are all over the place and they will kick a sign down to another agency just to milk that extra $5.
Today I spent almost 4 hours is PG county just for issuance of permits that had all ready been approved the week before. 17 permits cost over $1000 and the desk is only allowed to hand out 4 at a time. So you go in for 4 get back into the queue get 4 rinse repeat. All of this after it sat in review for 3 weeks because they wanted a photo of the building to show no other tenants had rights with in the 10% of frontage.( They use to have this but kept records in a basement and there was a flood so everything got ruined. They still have the paper work and its still wet and molded so they wont look through it ) This was for a reface of old awnings that had already been approved for the exact same thing under the previous permit for that location years ago. They just wanted to slap on new decals. Permitting cost more than install and material by almost 300% When you ad the permit cost and the billable time for me to sit there. If you have to deal with permits regularly I advise getting chummy with the drones.