Yeah, grain absorbtion will be nill for the batch sparge...software helps here
When you have to do extended boils you should stick with your hop schedule as close as possible....that's easier to do with a hop bag or spider because you can pull it out if you need to boil longer. Otherwise, there should not be any impact...With pilsner malt I always do 90 minute boils. If your boil time starts getting out toward 120 minutes or more you will get some additional Maillard reaction adding darkening melanoidins (a desired effect in some beer styles).
Something is always fermenting....
"It's Bahl Hornin'"
Kegged: Sour Saison, Pale Ale, Aggie Ale, Firestone DBA, De Koninck Blonde
Bottled: Belgian Quad (Grand Reserve), Derangement (Belgian Dark Strong)
On Deck: Pliny the Younger