I've only written 12 chapters so far. Around 30,000 words total. It takes me about 5 hours to write and edit a 2500 word chapter.
Based on your schedule I don't think you can write that much. You might be able to write shorter chapters? Some novels only have 500 words a chapter and publish two or three chapters a day. If you're really patient I guess you could stop publishing, then stockpile a ton of chapters and publish 1 each day. It'd probably be a bad idea though since you already have 27 chapters published.
Do you have a word app on your phone? I've heard a lot of authors in China write their novels completely on their phone. You might be able to work on it on your phone between classes or when it's slow at work.