Usually the fresh cut flowers lasts for 3-4 days,Freshly cut flowers will last longer if you add 1/4 teaspoon bleach per quart (1 liter) of vase water. Another popular recipe calls for 3 drops bleach and 1 teaspoon sugar in 1 quart (1 liter) water. This will also keep the water from getting cloudy and inhibit the growth of bacteria.
Change the water,clean the vase, and re-trim the stems every few days. Avoid heat, direct sunlight, windows, and even fruit: Flowers will last longer in a cooler room and if you keep them out of direct sunlight.