I've finally graduated to full boil/all grain. Done 4 so far. Let's assume single step infusion and "batch sparge" with 2 equal runnings. I need BV=7gals for a 1 hour boil. Do I need to do a "mashout" to raise temp to 168? If I mash thin, then there's not enough water available to add at mashout to raise the temp and still get 2 equal runnings. If I don't need to mashout, then can I just mash thin enough to get 1/2 my BV and just drain the tun for 1st runnings? How much wort can one expect to produce from a given grain bill? At what point is your grain bill so big that you need boil for 2 days; make 2 batches; get a bigger system; leave extract behind because you quit lautering when you'd collected all the wort you needed; tweak grain bill 'til you get efficient mash and add DME to boil?