Why do some things take forever?

Warning - rants coming.  Hope you don't mind.

Our son has had some issues as of late again at school.  They come and go, but the school is pushing real hard for "anger management therapy."  His doctor says that isn't what he needs, so we're working on getting him another type of therapy.  Like I've said before, he's being evaluated for ABA.  They have visited his school, and the regional center has approved it.  Now all we're waiting on is the therapists.  They said it could take a few months for them to put a plan in place.  So now that's just a waiting game.

The other waiting game?  We're looking to buy a house.  It's a short sale.  It's kind of ironic, because they take forever.  The homeowner is seriously under on the mortgage.  The bank that holds the loan has previously approved a purchase price, but the byer backed out.  It went back on the market, but we're waiting for the bank to approve it again (at the same price they approved it before).  We put in an offer at the end of October.  We're still waiting on the bank.  They've decided that they need another, newer, evaluation of home prices in the area, even though the one that they have is only a few months old.  Like it's going to suddenly increase to the point that they won't have to take the short sale.  It's rather frustrating.  We'd hoped to start moving in during Christmas break.  Now it's looking more like Spring Break, and that's assuming that the bank decides to approve it.  *sigh*