Direct sunlight should be excluded, and the ketone should be fractionally distilled properly after first washing a solution of it it with bicarbonate, brine and water (in that order) followed by drying, and then it will keep for well over a year at room temp, and much longer than that if you take extra care in excecuting the above purification.
Cool, dry and dark storage will prolong the shelf life even more, but is not required if the ketone is pure. Sloppily distilled ketone may discolor in just a few weeks at RT, in that case freezing is required for any storing (storage?) to be possible.