I assume seed cells probably aren’t dividing, but I guess maybe they could be using energy and slowly reproducing? And apparently bacterial spores can basically freeze themselves in time for thousands of years and wake themselves up once conditions are favorable.
[1] https://www.newscientist.com/article/dn14125-jesus-era-seed-...
Presumably the half-life of these proteins is shorter than free DNA but their presence will still change the overall half-life.
Environmental conditions are another factor. The inside of a seed could have a more controlled pH, temperature, humidity when compared to the surrounding environment. That would also change the effective half-life.
To reach cryptobiosis involves packing the interior of cells with materials and reducing metabolism tremendously (I suspect there is still some tiny residual activity, barely measureable), and probably also some repair enzymes for the inevitable strand breaks.