A couple of thoughts..........
Everyone has a different "sweat rate". Weigh yourself before and after exercise to approximate your sweat rate. For example, I sweat about 5-7 ounces per mile when jogging. Figure it in time relationship (ounces per hour) if you wish. The issue is to replenish the fluids every 20 minutes at about the rate that you lose them.
I'm told that as I lose weight (insulation
) that I may sweat less. Looking forward to finding out.
Wear synthetic clothes. They wick away the moisture and are much more comfortable than soaking wet cotton.