hiii anon! Hmmm everyone is different, it depends on your level of motivation and how much free time you have available. But i feel like generally it would be aiming a bit high :( It's good to pace yourself when writing so you don't get burnt out, and if it feels like you're rushing to meet a deadline it can kind of weigh on you and make it more difficult in my experience, esp if you end up forcing yourself to write when you aren't feeling it just to get it done in time. But of course some people find having a deadline encouraging, so it's all depending on you and your previous experiences! If you have experience writing longer fics and haven't had any trouble with staying motivated, i'd say it's possible. But if it's your first time writing something so long I think it's better if you have plenty of time to space out your writing and prevent burnout as much as possible until you become more familiar with your capabilities as a writer! So I'd say it's not entirely unrealistic, but it's definitely cutting it a little short and could become stressful trying to finish it in time. especially when you add in the time you'll need to proofread/edit. Whatever you do, I'm cheering for you and wishing you luck !!