The Prince asked:
Making a long story short... I'm buying my girl a single red rose tomorrow. The place where I need to buy it will prob close around 5 or 6 but i wont see her till around 7. How long will a rose last without water in about 100 degree weather?

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The Florist will put it in a small tube with water.
Ask for this, if not already on.
it should last pretty long if the bottom is kept moist (with a wet paper towel or one of the flower water tubes they put on). also, just make sure you keep it out of direct heat and in the shade. Do not leave it in the car, it will fry.
if it get no water you got about 18-24 hrs till it starts to wilt.