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 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.