A few days. You will probably be able to use the pool when the level gets to about 5.0 ppm 1) you should know the difference between residual chlorine and Free chlorine 2) Chlorine lost depend on size of you pool and temperature 3) circulation of water , temperature & size of pool will increase chlorine lost
You can add sodium thiosulfate, circulate for one hour and chlorine will be gone.
It would drop to the lower level in a little over one hour.
Use stabilized chlorine only so long as stabilizer level (cyanuric acid level) in pool is within the recommended range of 50-80ppm.
128 days
a year.
7000 days
You should not re-enter the pool until the chlorine level is 3ppm or less on your test strip, however long that takes. Chlorine is a known carcinogen and high chlorine levels are linked to many respiratory diseases.
320 d
As long as you keep your pH and your chlorine at the proper level it should not matter what technique you use.
Once chlorine level drops to 5 ppm or below, it is safe to swim.
7000 hours
around 7000 km.