I e-queried an agent and received a response right away, saying that he "absolutely loved" the sound of my query and would like to see a partial. I immediately sent it out and have since been trying to be patient. The agency's website does not specify response times, nor does any information I've found on the agent reference a window of response time. It has been about 2 1/2 weeks so far; what is a standard waiting period on a partial? Can I expect to get a response either way, or after a certain amount of time is it understood that an agent is not interested in pursuing anything further?
30 days MINIMUM on a partial and you can't start sending nudging emails till 60 days.
This is why Dog invented "second novels" (ie you start writing yours), art museums (go look at some art that isn't your form) and the Rutgers Basketball Team (get involved in something captivating that isn't about you or your book).
If you don't hear in 60 days, you can send a polite email.
If you don't hear in 6 months, assume no.
Under NO circumstances do you treat this as an exclusive and put all your hopes on one agent. You keep sending queries. LOTS of them.