Self Control and the Breaking Point

A recent post about Christian females & masturbation in another thread talked about how some girls can go without m-bating, while how it is harder for others to go without has made me curious as to how long --- one who does m-bate frequently( myself)---, could go and why i would give in to the urge.
For me its difficult in the way that it depends on the level of arousal that is taking hold of me.

I.e
Level 1 (dayish since last O)- not a big deal and don’t need to give into it by touching( very slight wetness mixed with the odd tingle here and there)
Level 2 (2-3 days without O)- moderately aroused most of the day with increasing tingles, wetness, thoughts and some light throbs here and there. –if I have privacy at this point its a done deal haha
Level 3 (4 + days) Constantly aroused, lots of sweet tension and tingles down below mixed with jolts and throbs...and thoughts are all about sex

Normally i wont NEED to give in till around Level 3 but most times i will m-bate at level 1 and 2 like if its at night and i want it so i can sleep/just cuz it would feel good.
I guess my question is what is your experience with this/what is your “breaking point” and ‘level’ in which you say to yourself “I really need to do it!” and give in?