I proposed an idea to speak at Strange Loop in St. Louis, MO, so I travelled domestically to speak. The event gave me a free ticket, and I was not paid to speak. My travel and accommodation was fully covered by the event. My employer did not pay my travel expenses, and I used my PTO to speak. It took me 3 weeks to prepare for my 40 minutes speaking slot, and I had a great time. I'm a man who has been speaking for 12 years. Also, I've only given, like, 4 talks in my life, but the first one was a looong time ago, so # of years may not be the most useful metric to rate my speaking experience.