Last year I planted one that had a root and after a few months, I gave up as no shoot appeared. I bunged it in the garden and a few months later, noticed a little shoot.
This year I found a stone that had rooted in my compost heap (I think it was one of the fruits that I forgot about and went gross, so I just slung it in there). Anyway... I planted it and it took a few more months to shoot.
Patience!