Correct. From the 3.5 FAQ:nittanytbone said:
"a change to the key ability score indeed affects the daily limit—
in the example above, the cleric would gain 2 additional
turn/rebuke attempts per day—but these aren’t just “free” uses.
Here’s why:
Assume the cleric above has a normal Charisma score of
12, granting him 4 turn attempts per day (3 + 1 for Cha bonus).
Casting eagle’s splendor increases his Charisma to 16, which
would grant 6 attempts per day. At the end of the spell,
however, his daily limit would drop back down to 4 attempts.
At that point, the player must compare the number of daily uses
expended to the daily limit to see if any still remain.
Here’s how that might work in play. Our cleric turns
undead twice, then casts eagle’s splendor right before a big
fight with a horde of zombies. During the duration of the spell,
he makes four more turning checks. When the spell ends, he
compares his new daily limit (4) to the number of attempts used
(6)—whoops, no turns left. Hope all the undead have been
destroyed, because even if the cleric cast eagle’s splendor
again, he wouldn’t have any more turning attempts available,
since he’s already used all 6 of his allotted attempts. If he could
increase his Charisma to 18, he’d “gain” one more turning
attempt (since he has now used 6 out of his allotted 7 daily
attempts), usable only during the duration of the Charisma-boosting
effect."
