I am currently aging the En Primeur Amarone I started the beginning of this month. I was thrilled to see the kit came with raisins, as well as a grape pack. Looking forward to the turn out on this bad boy.
My batch is now about 15 months old, and starting to come together on the taste and bouquet. Finish isnt as long as I had hoped and mouthfeel is so-so but who knows what another 12 months will do.
Up to your taste. Start with one and sample wine after a few weeks. I have been happy oaking my wine with one or 2 spirals during bulk aging for 6-8 months.