From when I was gone, I asked you, the lovely reader, to ask me questions and/or suggestions for future blog posts. I'm back. I'm (mostly) caught up with work. And now I'm answering your questions in segments. And asking for more questions. Here's the time to find out all you can about the agent (remember most everything is subjective and does not apply to all agents).
If an agent requests a partial of your ms, how long should you wait before following up? Firstly, check the agent's website for specifics. Most reply in 6-8 weeks. But some don't send rejection letters (in which case, assume it's a no).
The question was, can I ask the agent about it after six months? Answer: The agent has already moved on. But yes, you can follow up. You can do it after two or three months. But please, don't do it within two months. Personally, sometimes I'll let them build up then tackle them all at the two month mark (sometimes it's the only way, though I hate doing it).
And please DO NOT email and say "well, since I haven't heard back I'm assuming it's a no, thanks for taking a look anyway I guess." It doesn't make a good impression and we'll roll our eyes at you (we are immune to the sad puppy face. Just email very nicely and ask if the agent has had a chance to take a look and has received the materials (sometimes, for whatever reason, the cyber trolls eat your emails). If you don't get a reply to that email, then sit quietly. We have probably taken note of your email but were too busy at the time to respond, or chose not to respond.