GoPro Hero 6 - Storage Issues

I just found out today that my son’s travel baseball coach has a GoPro Hero 6 with chain link fence camera mount. He has asked me to help him with it this coming season. He told me that he was having issues the SD card filling up fast when recording games last year. I have no idea what size card he has (I am meeting with him tonight and will find out more about the equipment). Any ideas what the problem could be? How much space should a two hour game take up?

Also find out what resolution he’s recording in - high def takes up more space than standard def an may be unnecessary.