Does being real tall affect urine volume? They say < 2L a day is normal but I put out atleast 3-5 in a day. Is this because I'm 6'8" and just larger

Urine output varies. How much you eat and drink has more to do with your volume of urine than your size. It's true a big guy who is 6'8" will make more urine than a little old lady who is 5'5", but there is not a direct correlation to size. Stay well hydrated, drink at least 64 oz of water and non-sugary beverages a day and your kidneys will thank you!