I am not totally sure but in a normal pool it can mean just up or up and back. To find out, ask how many metres you have to swim and then estimate.
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The length of a pool is a measurement from one end to the other; not from one end to the other and back again! One length is is therefore once down.
When I was swimming competitively, a lap was down and back. A "length" was just once down the pool.
Yep! It's one way across the pool, but depending on the kind of pool your in it can still be a 50 or a 25