I ran a quick scenario of working 50% time (every second week off) to see what it would look like personally. I wouldn't have much in savings, but I noticed the compounding on my savings would take me to the finish line of FIRE (in less than 7 years) wheras full FIRE would be 4 thats right, half work doesn't double the timeline). The question then comes, do I want to do the push now, while my kids are young, for full FIRE or slow down, enjoy my kids now, and retire a couple years later.
Its down to a lifestyle choice. Sometimes there's no second chances. Whatever decision is made CoastFI or full FIRE sooner, comes with permanent consequences.