The length is only applicable at launch
The note length equates to gate length, which is everything (time wise) in a regular Amp envelope up to the initiation of the release phase
As I said, the best way for you to hear the env is to play with a constant Source, like a sample tone, some synth engines will not sustain infinitely, so that muddies the water
If you have a look you’ll see that some params are time based and some are automated based on note length, but if you have a long sustain, it will be much harder to perceive the gate/A:D:S phase (normal ADSR env) , test out with a shorter release … the AR envs are likely a little harder to explain because the hold phase can override the note gate time, if not on auto