My wait time was right at 4 months, from they received it too your approved. The times have been getting shorter.
Every can is a new stamp.
Look into the trust. Different levels allows you to do different things. The cheapest way is just a trust for you. Then one that allows you to have trustees, and then one to allow it to go generational. It's how much you want to spend, I called the NFA GUN TRUST in FL. Davis Goldman They talked me thru all levels. Then worked with an attorney in my state to cover any local laws.