When using continouse record mode, approx how many hours will record on the 32gb sd card before it starts to write over existing data?
You will get 2 to 7 days of recording depending on whether it is set on SD or HD. Then it will start recording over the oldest videos first.
Info From Support Section
When continuous recording is selected, your camera continuously records video to the microSD card. If you have Motion Tagging turned on, motion detected will be framed by a green box in the video footage. When the microSD card is full, the oldest footage will be overwritten. A 32GB microSD card will hold approximately two days of HD video and seven days of SD video.