Faster re-alignment with large heading changes I'm afraid. If you have to do it again go for a couple of 1 minute legs at 90 degrees to each other and it will speed up the alignment significantly. It's to do with the algorithm used to separate the total accelerations felt by the IRS. I'm assuming the GPS signal was good throughout.
This is straight from my friends at Honeywell but I'll try and find the references in the books.