A milestone, especially of The Release kind,
means endless crunch, generously dedicated to polish stuff that otherwise was perfectly fine.
In it, they tell terrible tales of bank accounts being drained — «There was one point where I had emergency gallbladder surgery that put me in the hole $ 50k due to the fact that I couldn't afford health insurance,» McMillen writes — to an
endless, vicious cycle of bugs, testing and development
crunch hell — «We were basically developing features during bug checking, which
meant every single time I turned on the computer and checked the bug database, the work I did the night before was pretty much rendered irrelevant.