no, but you should find out if it is (by keeping the streak for +100 days etc etc)
my theory is that once you reach past a certain point you can have more control over your boner or whatever and flatline is no longer an issue
But I don't think anyone really knows, I went 2 weeks clean and still could get boners when I wanted
Maybe some people respond to abstaining differently.
Look it up, or see for yourself. I have also read some opinions that "if you don't use it, you lose it" in which case you might consider Karezza which is sex/masturbation without orgasm and you can keep having sexual stimuli but not wasting ur jizz