If you can get two days sober you can manage that third day. If you can get three days sober, hey man, what's one more day on top of three days?
If you can get four days sober, well, that's pretty good, seems like one more day would make five, and you have four, so, just knock out that one more day.
And if you have five days sober, only twenty percent more would put you at six days. Surely you can stretch it out one more day.
And at six days, well, hell, it's like, one more day, and you have a whole week.
And if you have a whole week down, wow! you made it a whole week!
It's little hurdles, one by one, and you start picking up momentum, and good stuff starts happening. Don't try to eat the whole sandwich in one bite.