I will be doing my first beer brew in a weeks time and i will be doing a 1 gallon English IPA Recipe , my question is the recipe has good instructions but when it gets to the hops i am a bit confused , this is a 90 minutes boil the recipe says just - add you bittering hops, as prescribed above. all it says is 0.30 oz Challenger Hops at 90 minutes and 0.25 oz First Gold Hops at 10 minutes , so for the challenger hops does this mean put them in at the start of the boil for 90 minutes or when the boil has ended , and the same with the gold hops does this mean 10 minutes into the boil – in other words, for 80 of the 90 minutes? Or is it for the last 10 minutes of the boil.