Woody, the time is 30 seconds as previously stated. Don't let that worry you because the average scene in a blockbuster movie is 20 to 30 seconds. Any longer and the audience gets bored. here's what to do:
Firstly, FRAPS can be started immediately after it stops running. I can't remember the details, but there is a light on the top left if I recall. It either goes out or gets turned on after 30 seconds. Wait a second or maybe two and the light will go on or off again. Just hit the record button and start recording again for another 30 seconds.
To make a really great movie, move the camera to a different position for every new scene You can stop the train while you're doing this. Start the train, then FRAPs to record the next scene. You will end up with a few MASSIVE files (each 30 seconds is about 25 megabytes!) but just load the scenes into Windows Movie Maker and edit them like a real pro. MM will condense the files down to something like a little over a meg a minute.