Well, there's 10 chs before I reach ch 31 (vol 6), and considering the release schedule so far it's highly likely it won't take less than 3 months before I reach that point. That being said, 3 months from now means the story should be up to ch 36 by then and we'd probably be close to the release of vol 6, so I'd say there's a high chance we'll be working with vol 6 as well. After that... well, it's hard to say. The downside of working with volumes is ofc you have to wait until they're out, but it means I get a little less work to do so that's enough for me to want to stick to volumes til the end... But it's something I'll figure when the time comes.
Sorry for the long reply but I wanted to explain it thoroughly haha