I'm not sure if this is the place to post my question.
How many queries do you think one ought to have outstanding at one time? I have four just now. Going one at a time seems like a waste of my time, but sending 20 at one time seems problematic.
Also, if you've had no response from an agent in two weks is it fair to figure that they are not interested?
Should you always expect some sort of a reply unless they clearly state you will not receive one?
Thanks for any advice you can offer.

How many queries do you think one ought to have outstanding at one time? I have four just now. Going one at a time seems like a waste of my time, but sending 20 at one time seems problematic.
Also, if you've had no response from an agent in two weks is it fair to figure that they are not interested?
Should you always expect some sort of a reply unless they clearly state you will not receive one?
Thanks for any advice you can offer.