Cut roses should last up to approximately 1-4 days in room temperature or one week and possibly longer (subject to type of flower) with devoting care which includes proper steam cutting technique, frequently changing water, pleasant room temperature and caters adequately flower food.
However, How Long A Rose Might Last Will Also Depend On:
-The rose species
-The length of time it went without water after being cut
-The health condition of the plant from which the rose was cut