Hi Rand, that’s a good point on the environmental factor. I used to hate cold showers too, cold anything really but definitely look forward to cold showers now. I think 10-minutes isn’t necessary but it definitely feels much better. I’ve had shorter ones but it doesn’t quite elicit the same feeling. 5 minutes goes in a flash now. Let me know how the longer ones feel! I’d also love to know why you started doing it to begin with.