My LX 9000 with v9 is up within 2 or 3 seconds if I switch to a page which shows it while in a thermalling turn. I understand Dynons and other solid state horizons do the same. Why would you ever bring it up when in a spiral dive? I have no reason to doubt that it would perform correctly, but it sounds rather unlikely if equipped with an A-H to enter IMC without having switched it on.