You're %100 right. I meant that 90 days is a goal of mine which I would really like to accomplish. FYI the reason why they picked 90 days is stated on the 90 day chart and I quote :
Take the leap of faith and start your 90 days challenge!It's not all or nothing. Just do your best and track your days. Scientific studies show it takes about 90 days to change the neuron pathways in the brain created by addictive behaviors. Members of the 12-Step groups are given a "red" recovery chip when they reach 90 days. We also find the idea of 90 in Chazal. The Halacha is, that if one is not sure if he said "v'sen tal u'matar", he must repeat the Shmoneh Esrei. However after 30 days, one no longer needs to repeat Shmoneh Esrei when in doubt, because we assume that his mind has already gotten used to saying it. 30 days is 90 Shmoneh Esreis! Chazal knew that it takes 90 times of doing something to get the mind used to it. The Hebrew letter “Tzadik” – which symbolizes a Tzadik who is pure, also equals 90 in Gematria.
Our sages have said: "There is a small organ in a man, if one feeds it - it is hungry, if one starves it - it is satiated". The most difficult days are in the beginning. It will gradually get better.
Hitting the 90 day mark in of itself is nothing. Its the quality of my life which bh will get better and 90 is one of the means to improving my joy of life. Thanks for giving me your feedback - interaction with others that understand this issue is immensely helpful so thank you