I did this a few years ago. Don't get discouraged. As long as you can average two a day, you should do fine. I had some days I watched 4 or 5, some I watched none. Still finished in 11.5 months. How are you planning on watching them? One series at a time? Don't forget DS9 overlapped TNG for two years and VOY for five. What about the movies or is this just the episodes? Still, I hope you enjoy the journey you're about to take.