Its a handy tactic. I've made it through MIL visits and terrible vacations with infants, particularly bad call weeks, all-consuming grant writing periods, and that one winter when the kids wouldn't keep their gloves on and then screamed when their fingers got cold. I can do anything for one week, 3 months, one hour (long run with a mask on last weekend), 10 hours (a work day after a sleepless night) or 60 seconds (side plank).
It started in a bit of "wishing my life away' space, but has morphed into more of a testament to my strength. I just feel better knowing there is an end in sight (and in some cases---like exercise or work projects---reminding myself of how good I'll feel when I reach that end). Its a helpful reframing tool.
So it really sucks when I can't use it. When B was a newborn, he cried all. the. time. He never slept. Colic X 1000. I was barely hanging on (if I was at all, in retrospect, I was NOT doing well). I researched how long colic would last and made a countdown. And that date passed and he still cried and stayed awake. So the next countdown. The next. It was excruciating to not have an end date in sight.
That's what this feels like. Its not as excruciating in the day to day as living with a sleepless unhappy infant, but its hard. And not knowing how long makes it much harder. So I take it day by day and week by week. I can do anything for 7 days. or 84. But 150? 365? more?