Yeah, just let it drain for however long you can stand i guess

I've been reading about partial mash the last few hours and i seen it mentioned a few times now, not to squeeze the bag.
Jamil's book says 30min to steep but if your going to include base malt that changes.
Love to hear from people more knowledgeable in partial mashing.
I like to make graff with 2 row instead of DME, its way cheaper. Just not sure on the volume of the strike/mash water and AJ. I figure i would use 4lbs of 2 row.
According to the guideline in the book - you should use 1.5quarts to 1 pound of grain. So with the 4lbs of 2 row plus the 0.5lb crystal that would be about 6.75qt or -
little over 1.5gal of water for 4.5lbs of grain with no sparge.
After the 60min boil it will reduce some so probably just partial mash with 1.5 gallons, boil, cool and add 4 gallons of AJ?