I was out yesterday picking spruce tips for a beer that Harpoon is planning to release this winter. I now want to try it on my own, and found a recipe in The Homebrewer's Garden that says to add 1-4 oz. for 60 min. That seems awfully long. I'd figure more like 15-20 min. would be plenty.
Does anybody have experience with spruce tips? I want enough flavor to come through a porter-like beer with molasses, but definitely would prefer to go light than over-do it. What are people's thoughts on quantity and length of time in the boil?