The chloramine bond will actually break and the chlorine gas off but it typically takes several days to a week. Most folks do not wait it out, but break the bond with some sort of dechlorinator
Chlorine is usually gone in 24 hours or less with some agitation in the water.
either way I'd test the first try or two just to get some idea. chlorine levels are different from water supply to water supply, and agitation/ circulation has an effect as well. You will be best off to taylor a specific time to your specific set-up.
Dave