When I flew F4s the INAS could be aligned is 105 seconds if it had been shut down in a "Stored Heading" mode which enabled a rapid align. Could be wrong - it WAS 38 years ago
A set heading align (Set Hdg)was 90 seconds. In RAFG it was quite important because on RS05 the INAS was the critical delay. The record still goes to a 92 Sqn crew who made 3 minutes from fast asleep to airborne after a TACEVAL scramble at night.
Not bad after 38 years though!!!
