My relationship with my agent is pretty much a whenever we need to talk, we'll talk. Meaning I have something for her to read and we talk, or when she had my sub list we talked, or whenever she's passed along a pass, we talked. I have to say, after reading about some relationships here and from other sources, I'm really happy and thankful for my relationship with my agent. It's only been since Feb, but I can e-mail her whenever with whatever and she gets back to me the same day. Besides the MS she signed me with, she's read another in less than a month and reported back with revision notes, then got back to me on said revision three weeks after I handed it in with an interesting plan for it that has me biting my nails in anticipation.
I think if you said 8 weeks and you guys went into the relationship with the understanding that's what it would be, then perhaps you should wait. At the same time, I don't think she'd cut you lose for a sanity check-in.