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lemonade
Your deck is currently atan(3/10) = 17 degrees below your roofline. If you lowered it 50cm it would be atan(3.5/10) = 19 degrees below your roofline.
Assuming in the middle of summer the sun moves vertically (360/24) = 15 degrees per hour, or 4 minutes per degree. (19-17) * 4= 8 minutes.
Someone will be along shortly to tell me how I fucked up my maths.