Kit344
If you have a few hundred hours gliding, or you are a gliding instructor, then you can probably do the PPL conversion with the minimum hours.
I did a glider to PPL conversion about 25 years ago, I think it took at least double that time. Probably between 15-20 hours.
The requirements are the minimum, expect to need a lot more if you are an early solo glider pilot.
That was 25 years ago, since then we have had the JAA and now EASA. All the old credits have long gone. I recall doing many glider pilot conversions, but under European rules the max you get is 10% of the hours flown to a maxuimum of 10 hours. So 35 hours still required for a PPL.
CAP 804 is only relevant for National Licences; it has not been updated to the current EU Regulations so is useless in that respect.