I was invited to speak at jQuery Conf in Chicago, 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 was working while speaking at the event. It took me 9 days to prepare for my 30 minutes speaking slot, and I had a great time. I'm a woman who has been speaking for 1 year. Also, My preparation time includes the time spent on building an application that I was presenting in the talk, and most of my preparation days were full days.