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.
Tomorrow is the last day to order the team suit and have it delivered back to the team at no charge. Here is the swim shop link. http://store.swimshop1.com/chateau-elan-swim-team-c224.aspx. Team swimmers can wear a team OR black suit for the Swim Meets. Mini Wahoos do not have to wear a team or black suit. Save the team suit for the meets, wear a practice suit for practices. Your swimmer should also have 2 pairs of goggles.