I mean, a reasonable amount of free time is my current answer.
However, I used to write this much/more when I had a long hours job with a fair amount of stress, and back then I think the answer was just that I found writing a stress relief. I'd keep notes on breaks at work, and then go home and just write until I blew off the stress. It was kind of snatching a couple hours of solid writing time in the evenings, and maybe half an hour in the morning.
But that was the upswing of a new fandom, so I was sort of mentally writing in my head ALL THE TIME? Like for the issue of momentum on long fic, I think it's less getting long blocks of time to write as keeping the story going in your head when you're not able to actually type words on a screen, if that makes sense. So the momentum didn't get broken up, because I was always kind of picking away at how to put things, even if I didn't always remember everything I thought of later, the impetus to work on it carried over.
Re: Output, oh output. Wherefore art thou, output?
However, I used to write this much/more when I had a long hours job with a fair amount of stress, and back then I think the answer was just that I found writing a stress relief. I'd keep notes on breaks at work, and then go home and just write until I blew off the stress. It was kind of snatching a couple hours of solid writing time in the evenings, and maybe half an hour in the morning.
But that was the upswing of a new fandom, so I was sort of mentally writing in my head ALL THE TIME? Like for the issue of momentum on long fic, I think it's less getting long blocks of time to write as keeping the story going in your head when you're not able to actually type words on a screen, if that makes sense. So the momentum didn't get broken up, because I was always kind of picking away at how to put things, even if I didn't always remember everything I thought of later, the impetus to work on it carried over.