He doesn’t need to. He can just walk out of the Wizengamot while cloaked and then walk back in. Each turning gives him an hour, after all, and while he used up his six for the previous day he hadn’t used any for the day of the vote itself, as of chapter 80.
Since when? A while ago he convinced Dumbledore to give him the full six hours rather than two, but I don’t think we were ever told that he can use it at will now.
ETA: From Chapter 77, Self-Actualization Aftermaths, emphasis mine:
(Some time later, an earlier version of Harry, who had invisibly waited next to the gargoyles since 9PM, followed the Deputy Headmistress through the opening that parted for her, stood quietly behind her on the turning stairs until they came to the top, and then, still under the Cloak, spun his Time-Turner thrice.)
He doesn’t need to. He can just walk out of the Wizengamot while cloaked and then walk back in. Each turning gives him an hour, after all, and while he used up his six for the previous day he hadn’t used any for the day of the vote itself, as of chapter 80.
What do you mean he doesn’t need to? That’s the only way to use it before it unlocks at 9pm. Unless you think the trial is after that?
… Harry’s already beaten that restriction.
Since when? A while ago he convinced Dumbledore to give him the full six hours rather than two, but I don’t think we were ever told that he can use it at will now.
ETA: From Chapter 77, Self-Actualization Aftermaths, emphasis mine:
I seem to have been mistaken. Still; Harry could simply destroy the protective measure.
Quirrell did, I don’t think that Harry knows the spell that Quirrell used.