IA's need additional time the first time
they inspect an aircraft to assure themselves that the paperwork is in
order and that mandatory work previously signed off was, in fact,
correctly done.

If the last 5 annuals were done and the logs state that all AD's were coplied
with,
why would the next IA have to spent more time. Just make sure that new AD's are
complied with.
Again why do shops give an estimate to do the annual, then add for additional
parts and labor. One shop will say $700.00 for the anual another $1000.00 and
the third at 1400.00. I am sure that inspection tome should be the same. Shop
rates can vary, but how much??