It took Lirael three months to work out how to wake the next four spells in her bracelet, though the secret of the sixth and seventh remained beyond her. But she didn't wake the extra spells at once, taking another month to create an illusion of the bracelet as it was supposed to be, that would sit over her own and hide the glow of the additional emeralds.

Lirael, Ch. 6, pg. 56