Though kiwi fruit is widely propagated through grafting,for rootstock prepration we use seeds, my question is for how long seeds can be stored at room temperature before sowing it?
Different techniques can be used to store long this recalcitrant fruit. One type of option, you can read the following article: https://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-70332011000400007
if you accurate information about longevity of kiwi seeds you require to evaluate publications around hydro-thermal time models that these models are fitted to environmental data such as humidity and temperature.
in the other hand, these models tell you in any temperature and humidity conditions what period of time you are able to store your seed lot.