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.
Interval Basics. Swim times vary according to age and ability. In general, average lap swimmers in a 100 m pool comfortably complete a 100 m swim in two minutes. A swimmer who has an easy interval time of two minutes would consider a 100 m time of one minute 30 seconds very good.