InDeoEstMeaFiducia
It's the usual mumsnet race to the bottom. It's the same every year. The same posters will be whizzing round all the other threads over the next few months to remind everyone how creepy the elves are and to call children who get a new pair of PJs on Christmas Eve spoilt.
We don't count as such but I do have a spreadsheet so will be able to tell by Christmas. We just use one because presents have to be stashed in several different places and it's so easy to forget things I've picked up.
The kids each get a stocking which I'm terrible at, year on year I end up with too many little bits and so a few left overs will get thrown in the Santa sacks. The stockings aren't stretchy unfortunately so it's really hard to judge. But I'd guess about 10 gifts roughly. There's nothing extravagant in there. A chocolate orange, chocolate coins, some hair bobbles, a card game etc... small stuff.
The kids are allowed to put no more than three things in a letter to Santa. No electronic devices and must be reasonable requests (eg. they got told Santa wouldn't bring one of those giant ride on ponies a few years back as he would know the house wasn't big enough). I may slot the odd surprise in here so maximum of five gifts. These sit in a sack by the fireplace.
We buy them probably around 10 from us. This is where I slot things they may like but not ask for - books, clothes, crafts etc. Also if there was anything like a console or tablet that would come from us in this pile.
Finally they get a few bits in a box on Christmas Eve. Almost all sensible things like PJs, slippers etc with a bit of choc and small teddy on top. So maybe 6 or 7 things in there.
So close to 30 maybe a few more spread over the two days? Then whatever relatives have sent them too.
As others have pointed out it sounds excessive if in your mind you are picturing 30 toys, but a large amount of what they get will be useful and sensible too. In our house Christmas is a balance between things you really want and things you need. It doesn't have to be one or the other.