Have a conversation. That's it. Just have a conversation. From rule of thumb this can go from 30 minutes to 3+ hours. So don't block off time ahead; if this

Have a conversation. That's it. Just have a conversation. From rule of thumb this can go from 30 minutes to 3+ hours. So don't block off time ahead; if this person is valuable to you, give them all the time you and they need. Edit: I do not buy in to multiple interview rounds. If secondary interview is needed, only for a significant role. Multiple interview rounds indicate no one is taking responsibility.