Out of my 100 queries, there remain ten that there is still time for the agent/agency to contact me before they "time out." What that means is, many agents/agencies have a "no response from me means I'm not interested" policy. After the standard waiting period of 8 weeks--which seems short but most people agree that's a good period to wait--the queries "time out," indicating that the rule ("no response equals 'no'") is in effect. At that point, I call it "dead" and I go to the next queryable agent.
Simple process. There is a flaw: if the agent didn't get the query, for instance it came in and was--for some reason--marked SPAM and deleted; or their email server crashed--any number of possible technological glitches. End result is they didn't get my query, and I have no way to know it. However, I'm sort of unwilling to "ping" them again and say, "Hey, did you get that query or were you just not interested?" (I would, no doubt, be far more eloquent than that.)
This is why I really, REALLY, REALLY appreciate agents that have either an auto-responder set up to say "We got it, dude!" or they take some of their valuable personal time to write an email saying the same thing--or have a lackey do it. At least then I know and don't have to wonder what the heck may have happened.
Such is life of an aspiring author.
In case you're wondering: of the 100 agents/agencies I queried, only ONE agent ever asked for a partial manuscript. Only one. That sounds about right--based on odds--but others are telling me that for every 20 queries, there should be at least one request. I find that hard to believe. Of all the people I am vaguely knowledgeable about none of them have a 5% request rate.
Could be me, however. Perhaps I'm just "special," in the wish-I-wasn't-special-like-that sort of way.