Voldemort would not have given the properties to his body before now, because he had not had the Stone, and without its permanence effect, after a few hours the transferred properties would wear off.
He was overconfident in giving them to Hermione now, instead of to himself.
Voldemort would not have given the properties to his body before now, because he had not had the Stone, and without its permanence effect, after a few hours the transferred properties would wear off.
Voldemort also says that the subject sometimes dies when the properties wear off, so he has very good reason not to give them to his body earlier.
Voldemort would not have given the properties to his body before now, because he had not had the Stone, and without its permanence effect, after a few hours the transferred properties would wear off.
He was overconfident in giving them to Hermione now, instead of to himself.
Hermione needed them immediately, due to fears of Transfiguration sickness. Voldemort did not.
Voldemort also says that the subject sometimes dies when the properties wear off, so he has very good reason not to give them to his body earlier.
He should have brought two trolls and two unicorns. Or maybe three, just to be safe.