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.
Swimming is a life skill as well as great exercise and a challenging sport. Lessons are available for beginner, intermediate, and advanced swimmers of all ages 6 months through adults. Meet Monday through Thursday for 2 consecutive weeks, totaling 8 classes. Each class is 45 minutes.