60 min or 90 min? Infusion or Step?

[BrewBlender]

I will be brewing a partial mash recipe this weekend. It's from a extract recipe I brewed when I first started and now I've converted it to a partial mash recipe by multiplying 1.5 lbs per 1 lb. of the extract syrup.

My first question is how do I know if I need a 60 minute or 90 minute boil? The original extract recipe was a 60 min. Do the same? In the extract recipe I boiled about 2.5-3 gallons and added the remaining water to the fermenter. But now I have a 10 gallon pot and the capability to boil all 5 gallons? Do I do this? Do I change anything?

Next...infusion or step? Does it matter and is it dependant on anything?

[bub]

wow a whole lotta info here...
if you are doing partial mash I see no reason to do anything other than simple infusion, especially if it is your first batch... start simple and work your way up
do a full boil (90 minutes)
NOTE most people who refer to a 90 minute boil start counting from the time the boil starts i.e. first major bubbles... many who do a 60 minute boil begin the count AFTER the foam has settled and it stops trying to boil over... guess what... the timing ain't much different... start counting your 90 minutes when it starts to roll and then start doing your hops at 60 min left or whenever the recipe calls for
the incresased boil time will help coagulate all those funky protiens from your mashing
since you are going to be doing a full 90 min boil start with ~7 gal of water and you will end up with ~5.5 gal left at the end perfect for the fermenter!

Have fun and relax it will turn out
BUB

[Speyedr]

yep.. sounds right to me...