One thing's for certain; its absolutely not the same from one week to the next. One week I might be at living university with an essay due in. The next, I'll be at home and want to spend time with my family. Nothing is the same, which is why I personally find the set-in-stone, inflexible 'writing schedule' completely impractical!
I know that it works successfully for some people, and if you're one of those people then I commend you! If you can stick to it, then they really can work wonders for your productivity. However, I'm a lot more hap-hazardous with my writing time. Between lectures I'll scribble on the back of my organic notes, I'll be tapping away on my iPod while riding the bus, or maybe for half an hour if I can spare it before Frisbee practice (I find exercise is one of the best inspirational activities).
From personal experience and talking to other writers, I've found that the practicality of a schedule works best for people who are trying to get into the habit of writing everyday.
For beginners, it's a great way to get continuous practice and start to feel out your style. I've also heard that it works well for people that find the idea of writing a book or finishing a collection of short stories/poems as a daunting never-ending mountain.
My advice for anyone trying to finish a task like writing a novel, is to experiment. Find what works for you. What works for one person might not work for another, after all, everyone is different! Try listening to a different kind of music while you right, or none at all! Try going out and finding a library or coffee shop or even a nice area of the park to sit and scribble away. If the schedule doesn't work for you, or it does but there's to much/to little hours, then rework it! Everyone is different, and can be productive in different ways.
But most of all, whatever you do, do at least attempt to write at least once every day, because even just half an hour every day eventually adds up.
Well that's all from me this week. I hope you liked this post. If you did, please hit the like button. And I'll see you all next time.