> A hobbyist pilot with his PPL needs a minimum of 24 hours and a checkride every two years
Citation needed on the first part. (The second part is also not a checkride, but rather a biennial flight review, for which a checkride will replace the need for, but a BFR will suffice.)
I went by the PPL(A) requirements in Europe [1, lower half of page 2] - and gotta correct myself, it's only 12 hours flight time (with 12 starts/lands, so at least 12 separate flights of at least an hour length) plus a 1h checkride in the 12 months prior to expiry (every 24 months).
Since the PPL is ICAO regulated, it should be the same case in the US.
It is not the same in the US. The only currency requirements for Part 91 (private) aviation per the FARs are the landing currency requirements (only needed for carrying passengers), IFR currency [if intending to fly IFR], and the BFR.
So per your second link, our laws match, only that instead of the checkride we have to do in Europe, you have 1h of "ground training" review with a qualified person?
Citation needed on the first part. (The second part is also not a checkride, but rather a biennial flight review, for which a checkride will replace the need for, but a BFR will suffice.)