Time-Turners are not normally locked like Harry’s is (which also has the restriction on the time of day when it can be used). For instance, in Prisoner of Azkaban, Hermione uses her Time-Turner to transport her, Harry, and Ron back in time simultaneously.
Then how did Quirrell figure out the restrictions on Harry’s Time Turner without so much as laying eyes on it? All he should have known from Harry’s temporal discrepancies was that the thing existed. That implies to me that the set of locks Quirrell mentioned are a standard operating procedure, and the only extras that Harry’s turner has is the protective shell / locked before 9 PM combo.
See also posts 1816 through 1822 in the TVTropes Methods of Rationality thread.
The snake twitched its head, a snakish nod. “Many resstrictionss. Locked to your usse only, cannot be sstolen. Cannot transsport other humanss. But ssnake carried in pouch, I ssuspect will go with. Think posssible to hold hourglasss motionlesss within sshell, without dissturbing wardss, while you turn sshell around it. We will tesst in sseven dayss. Will not sspeak of planss beyond thiss. You ssay nothing, to no one. Give no ssign of expectancy, none. Undersstand?”
Nevertheless, it seems possible that if Mr. Hat-and-Cloak has a Time-Turner, he would be able to break the wards on it (Quirrell only avoided doing so because it would be noticed upon inspection of Harry’s Time-Turner, and Mr. Hat-and-Cloak is not likely to have that problem).
Then how did Quirrell figure out the restrictions on Harry’s Time Turner without so much as laying eyes on it? All he should have known from Harry’s temporal discrepancies was that the thing existed. That implies to me that the set of locks Quirrell mentioned are a standard operating procedure, and the only extras that Harry’s turner has is the protective shell / locked before 9 PM combo.
See also posts 1816 through 1822 in the TVTropes Methods of Rationality thread.
So the quote is
Nevertheless, it seems possible that if Mr. Hat-and-Cloak has a Time-Turner, he would be able to break the wards on it (Quirrell only avoided doing so because it would be noticed upon inspection of Harry’s Time-Turner, and Mr. Hat-and-Cloak is not likely to have that problem).