But there are prime times to query- February and March are good. Skip April again holidays and Spring Break. May and June are good. Skip July and August-there are conferences and vacations. September is good, but beware that October is also prime conference months. The problem with conference months is that editors and agents are again inundated with queries from people they saw at conferences. The key is to guestimate when the agent/editors desk will have the least amount of slush. When they will be looking to fill slots.
Once you send out your query/partial be patient. Trust the editor/agent to do their job. That said, things do get lost in the mail so after 8 to 9 months you can send a quick e-mail-don't call- and see if they got your partial. Then wait some more.
What do you do while you wait? Go and live your life. Write another book. Have fun. Read a new craft book. Try again. Because as Kevin Spacey said in a video interview going around, "There is no prize, only the journey."
As a side note, the kind and lovely Linda Kage gave this blog the Cherry on Top Blog award. Thanks, Linda. :D