A day or so, depends on how swamped they are, though your primary and secondary methods of BIOS update are the manufacturer and retailer.
Manufacturer: MSI - went through their support and they wanted me to RMA my motherboard, even though I asked for a bios update. Through reading their RMA, you are most likely getting a refurbished back and not your the board you bought. All my parts are bought new and just arrived 2 days ago, do not really want to go a refurb route.
Thank you for the response appreciate it.