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.
How long should I wait to go swimming after adding any of my swimming pool chemicals. I've heard different stories from different people. I've heard you can swim immediately, but some people say to wait 15 - 30 minutes, and some say even longer, like 10 - 12 hours. I want to be safe, so here it goes: