How often should I talk to my mentor.
"How much time do I need to commit to being a mentee or mentor?"
A rule of thumb is that you should be having 1 meeting a month minimum. At the start of the your mentoring journey you may want to do it more frequently with 1 meeting every 2 weeks for the first few months.
Each meeting should be 1 to 2 hours long but I would recommend giving yourself 1.5 hours such that you don't feel rushed in each meeting and all topics can be properly discussed.
So 3 hours in the first few months and 1.5 hours for the following months. Was that what you were expecting?