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.
See LCM above. Nationals. USMS National Swimming Meet held two times a year. The Short Course Nationals are held at the end of the short course season in May, and the Long Course Nationals are held at the end of the long course season in August. Negative Split. Swimming the later lap or set distance of a swim faster than the previous.