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snalberski said..Andrash said..Perhaps you can experiment:
1. Put a few 1mm holes in an old wetsuits or even in a plastic bag;
2. Pour one or two liters of water in.
3. Count the minutes how long it takes for the water to drain.
(be patient

)
Problem with that is that it doesn't factor in the pressure applied to the water by the stretching of the wetsuit. A loser fit will obviously apply less pressure than a tight fit.
Sure, it doesn't. The point is, however, that you do not stop just to drain the water. If, when you ride, more water enters than drains, you still end up with elephantiasis.... As I recall, no matter what holes and how I made, I had to reach down and drain by hand at every turn... until I cut the whole calf portion down.
I think, the riding style and perhaps board design make a difference too. Not sure how it is on a surfboard, though. I had this problem only up until 10+ years ago while on a TT.