Aloa....so I am going to windsurf on sunday...and u can determine for how long. Its from sunrise to sunset; that is 5:30 to 20:30 which amounts to 15 hours.

How much of that time I will be on the water depends on how much money you are donating. I will apply the  formula shown here....


That amounts to 7 hours in case you dole out a combined £1000.