How do you nurture for cut roses if you plan on giving them to someone 8 hours latter?

How do you care for cut roses if you plan on giving them to someone 8 hours subsequently? I want to buy roses, but because of the warm weather (90+), I'm not sure how to build them last adjectives day. I call for to buy them early because I enjoy work all hours of daylight, and when I get stale most of the shops will be closed.
Answers:    Once you put them in a pitcher of water also incorporate about 1/2 a crushed aspirin up within the water..do not use ibuprofen or tylenol etcetera it have to be plain aspirin...
Put'em in the refrigerator, loosely covered surrounded by plastic. That's what the shippers and florists do.