He or she establishes the length, frequency, time, purpose, and level of accountability. However, be flexible enough to recognize teachable times, and to debrief after positive and negative events. As the relationship develops, the mentoree will soon have soon input into what is discussed and when. Offer your network. Much of your effectiveness is not what you know but who you know.
Mentors help their mentorees stay focused on why they do their job and who they do it for.
Ask the right questions. A mentor is not the answer person, but rather one who gets the mentoree to do helpful self-reflection. Mentors are like mirrors that help mentorees see what's preventing them from being all they can be. If the mentor has built a relationship of trust and safety, the mentoree is more inclined to accept correction. However, in a mentoring relationship, we have an even greater platform for accountability.