Video Storage on microSDHC

Does anyone have any idea how many hours / days of video is captured in a 32 Gb micro memory card?

Two or three days on continuous recording. If just recording events it depends on how many events and how long they are. All my cams record continuous, about 9GB per day for the V3 cam, V3 Pro and V4 cams are a little more that is why I use 128GB and 256GB cards.