I try to make the conferences very brief, really only a few minutes. They bring their book and reading log to the conference. I check that they have filled out the log on their book, we discuss what genre it is and why, I ask them a couple questions about the book, and I have them read aloud a paragraph to me. Then I stamp a chart in their log and the one on the bulletin board and they are on their way!
My students used to just tell me when they finished a book, and I wrote it on a sticky note, but this year I created a spot on the marker board where they can sign up for a conference on their own. They find their name in the basket and put it under the "I am ready for a book conference!" sign. This has worked out great, since they don't have to interrupt me when I am conferring with other students, and I already have too many sticky notes on my desk!
You can make one of your own by downloading my fully editable PowerPoint set at my TPT Store!