I can see both sides, sure it would be a pain if you are a private hirer an needed to go somewhere ASAP and then not be able to take the plane.
On the other hand, if I owned a plane you would sure as hell have flown a lot more than once in 90 days before you get to even look at it let alone fly it! This is pretty common with private aircraft hire anyway, most owners are understandably protective of there offspring
