Hi, Hazel -- just a "my two cents" suggestion about your querying process going forward. Sending out sixty queries in one day is a LOT. In fact, while querying widely is to your advantage, I'd suggest that you make your next volley much smaller. I started off sending out between five and eight queries at a time, and finally settled on eight as the magic number I wanted to have "open" at any time. As soon as I got a negative or positive back and fell below that eight, I would send out another one or two to get back up to that number.
My logic was stolen from other writers here on the AQC boards: if you query in smaller batches, it can become easier to see patterns in rejections (people seem to like the query letter, but are cool on the pages themselves; only queries with pages get attention; and so on). This was really important for me after month 2 of querying, when I realized my letter was the problem and did one more overhaul. After that, I started seeing a lot more requests.
My only concern for you might be that you'll run through your list of researched agents very quickly sending out sixty at once, and possibly not be able to use your rejections to help you make strategic revisions.
Anyway, this is me butting in with a comment you didn't ask for, so please disregard if I'm overstepping. . . But since I know I wish I could have those early queries back and start over with those agents with my improved query package, I wouldn't wish that feeling on anyone else!