I do not work for VM. My services: HD TV on VIP (+ Sky Sports & Movies & BT sport), x3 V6 boxes (1 wired 2 WiFi,) SH2 in modem mode with Airport Extreme Router +2 Airport Express's. On VIVID200, Talk Anytime Phone, x2 Mobile SIM only iPhones.
@Patricia161 unfortunately, no once the upgraded config is sent to the hub and it reboot, then the speed change happens immediately, there's no 'settling down' time. This is actually a worry since it hints towards you either having an intermittent connectivity issue or possibly they didn't actually bother to upgrade you for a day. I'll tend towards the former, so keep a check on your connection and come back if you have problems in the future.