This means that the battery is discharged down to 10.5 volts over a 20 hour period while the total actual amp-hours that it supplies are measured. Sometimes ratings at the 6 hour rate and 100 hour rate are also given for comparison and for different applications.
Pool meets are usually no more than 4 hours, but beach meets last about 7 hours. It depends how many events are in the meet. And then if it is a really big meet (like a tournament kind of) it can last days. Hope that helps.
Swim Workouts for Swimmers - 6 x 250 Faster as They Go. Share. This middle distance focused swim workout uses 200s. The workout moves you back and forth from easier to harder, back and forth, steadily moving toward an emphasis on faster swimming as the set progresses.