Your flowers will do OK being out of water for about 30 minutes. If you are traveling bring a cup of water along for longer vase life. Each flower variety has a different vase life. Lisianthus and ranunculus can last from 12 – 14 days. Dahlias, the star of the show, will last 3-5 days. A flower food package will come along with your bouquet. Keep your vase water clean.