Chlorine will kill most bacteria very quickly as shown in the table in
this post. For fecal bacteria, 99.9% are killed in less than a minute or two.
Chlorine reacts with ammonia to form monochloramine very quickly with 90% conversion in about one minute (with usual FC/CYA ratios as prescribed by this forum). It takes longer for chlorine to further oxidize monochloramine to end products where it takes around 4-1/2 hours for a 90% conversion (again, at usual FC/CYA ratios). The products with nitrogen at this point are 81.8% nitrogen gas, 8.5% nitrate, 7.9% monochloramine, 1.4% dichloramine, and 0.3% nitrogen trichloride. So you can see that
chlorine oxidizes ammonia mostly to nitrogen gas and only to some nitrate (if you wait long enough, the chloramines will be fully oxidized). You won't find nitrite in swimming pools with chlorine because chlorine will quickly oxidize it to nitrate.
In practice, the chlorine oxidation of ammonia is continuous as the ammonia is introduced into the water. In a residential pool, the bather load is typically low so one normally doesn't see the chloramine intermediates. One person-hour of being in a swimming pool creates a chlorine demand of roughly 4 grams so if this were all from ammonia (and it's not) then in a smaller 7500 gallon pool this would be 0.14 mg/L (ppm) Combined Chlorine (CC). Most of the chlorine demand from bathers is not ammonia but urea and that is much slower to oxidize from chlorine taking days. The following table shows the chemicals with nitrogen (which are those which chlorine reacts with) in sweat and urine (the table is from
this World Health Organization (WHO) document):
......................
Sweat .........
Urine
Compound .
mg/L .
% ....
mg/L .
%
Urea ............ 680 ... 68 ... 10,240 . 84
Ammonia ..... 180 ... 18 ........ 560 ... 5
Amino Acids ... 45 ..... 5 ........ 280 ... 2
Creatinine ....... 7 ...... 1 ....... 640 ... 5
Other ............ 80 ..... 8 ........ 500 ... 4
----------------------------------------------
TOTAL ......... 992 .. 100 ... 12,220 . 100
The typical discharge over an hour is around 200 ml of sweat and 50 ml of urine though this depends on the level of activity.