How many laps is equal to swimming 1.5k?

In an Olympic sized pool at 164ft, swimming from one side to the other side would be about .05km. So, you would have to swim to the opposite side of the pool 30 times to swim 1.5k.Assuming that 164ft is the pool size and one lap is considered swimming to the opposite side of the pool.

If you're in a normal sized pool, you would need to swim 60 lengths.