He visited a lot- in these photos, at 9pm, 12.30am and 3.20am, but they had 23 different visits recorded on the camera. It's hard to tell if it's the same hedgehog each time, but I thought the third photo might show a smaller one (but it could just be the angle of the photo).
A cat made an appearance a couple of times, but luckily the hedgehog was nowhere to be seen then!
There were lots of videos of the hedgehog as well. This one shows him having a really good dig in between the patio slabs. I assume he'd lost one of his treats in there.