on the 73 classic that i used to fly, we used to do a full-align on every stop but then the rate of IRS failures started to go up. from recommendation of engineering, we then switch to a fast-align on transit of less then 1 hrs (or there abouts).
on the current 777, there's no fast-align
for the ADIRU's so the recommendation is a realignment every 24 hours.
SR