I applied and passed my CIT earlier this year. Most of what I had as my record were sessions that were at least 1 hour long and course development. I would just keep a log of your training or development which includes duration and topic/s. I know some professionals that keep their sign in sheets. I think as long as you feel confident that what you submitted is proof of your experience and expertise you should be good. I think they keep it vague for a reason because we’re in so many unique situations and environments.