D2 and D3 as noted it is standard for Saturdays to be a DH. As seasoned veteran of these games I can assure you that you will see some long ugly contests. You have teams that are deep into the staff and hitters who are getting lots of AB's so they are locked in.
Even well played games can be 3.5 hours it is a long long day for parents and players. They kids are at the field 1.5 hours or so before game time, roughly 7 hours of baseball with 30 minutes in-between games... 9 hours is about standard (not really long) and then jump on the bus to head home. The parents have travel both ways and "only" 7 plus hours at the field. You will sleep good at night I promise you that.
Spring Break DH's in Florida can be worse...I have seen 9 hours plus of baseball for 2, 9 inning games in a day...and they play 7 or 8 games in about 6 days while down there typically.