It nothing like the track events.
Even the track cycling, they will do two different events
Track Athletics... 2 events or may be 3 at a push with a relay
Lochte, phelps, franklin and others that do freestyle. All enter god knows how many events. Swimming seems to favour heavily the freestyle side of swimming
100, 200
Freestyle, medley, butterfly, backstroke
Throw in the relays
It is something when they get less than 10 mins between medal events. I now it shows they are very good but it also highlights the mental amount of races there are