"maintenance" Call it what you want, but to me website maintenance is something that companies do in the background (updating pages, adding info) without affecting the use of the website, or something they do for a couple of hours in the middle of the night on weekends, which makes some or all of the website unavailable for those few hours.
Website "under construction" for 10 days is in a different category to me. Especially when you have a Federal Regulator breathing down your neck for regulatory non-compliance.