Here are the average recording storage times for a 32GB SD card: Recording time will vary according to the resolution setting used and the card capacity. Over that time I have been keeping a log and have recorded the approximate recording time achieved from full battery charges and with particular SD cards.
We have decided to take a closer look at GoPro Hero 3 Micro SD Recording Times I have had a GoPro Hero 3 Silver and Black editions for almost a year.