Round and round we go

I sent out a round of queries after graduating from my MFA program and got what I think is a fairly positive response: Fifteen queries, four requests for full manuscript. Two rejections with fairly extensive comments. Two just... waiting. From what I can glean from various forums, an inordinately long time. And I'm afraid to say, hey, just checking back on that? Because I'm afraid they'll just say, oh, right, sorry -- no thanks. I think it would be far better to go back to them and say, hey, I got an offer for representation, are you still interested? So that means back to querying. Which makes me despair. It's not just a matter of sending out a bunch of letters, it's research. It's time. It's sitting at my desk on the weekends when I've sit at my desk all week. It's spending at least a couple of hours on each prospective agent, honing each pitch to appeal to that particular agent's tastes. Maybe they'll answer, maybe not. And how do I know I'm picking the right ones simply based on their interests? Who are they, really? The worst part: More time away from actually writing. It's an investment when you know it will pay off in the end -- but that's the big question. Books are getting published, we know this. But the window of opportunity feels barely cracked open. It all seems so nebulous. A roundabout in the fog.