Ooh, ooh, yes, this is one of my favorite subjects. You should look into expert performance studies.
K. Anders Ericsson has done a lot of research in this area:
here's a neat little paper (PDF) that summarizes some of it, though it's informal and geared a little bit towards managing/leading.
Here's a longer, more academic paper (also PDF) that properly cites its sources. Anyway, particularly relevant is the distinction between any old "practice" and what Ericsson calls
deliberate practice. Slogging away at something in a repetitive way isn't going to help you improve: deliberate practice involves constantly and consciously analyzing your own performance, identifying problem areas, and looking for ways to improve.
Ah, but I'm getting a little sidetracked, since your post was more specifically about practice time and resting. So, some of Ericsson's research has indicated that, past a certain point, "more practice" does not necessarily equal "better performance". In a study of top violin (I think) students, those with a practice schedule of about two hours a day separated into one hour chunks (e.g. one in the morning, another in the afternoon) tended to do better than those who spent 6-8 hours a day practicing straight. According to Ericsson, most experts in most fields don't spend more than 5-6 hours a day working with their chosen subject, and it's much more common for them to spend about 2-3 on average. (Though, Liszt, probably one of history's greatest pianists, reportedly practiced for at least 10 hours a day; and we should keep in mind that the hours an expert
needs to devote to a field probably drops as their experience and knowledge grows, so we should be cautious drawing conclusions from already-established experts. Ericsson's also well known for establishing the "10,000 hours of deliberate practice" estimate for becoming an expert, and presumably, the more deliberate practice you could fit into a day, the faster you'd reach that point? If your brain can handle it without going numb.)
(By the way, this is mostly from memory, so I'm probably getting a few of the details wrong. I'm pretty sure the gist of it is right, however.)
Regarding the importance of rest in particular, there's also been a fair amount of research that links sleep to the acquisition of new knowledge and skills. See articles
here,
here, and
here. More specifically, sleeping seems to help cement recently acquired information into place, enabling the brain to manipulate it more easily and adeptly later on. The second Ericsson article I linked to at the start of this post mentions other research that indicates expert performers get, comparatively, a lot of sleep, and indeed, apparently a surprising number take naps during the afternoon. (I hadn't known that myself until looking at this article just now, actually. WARNING SLIGHT LAYMAN SPECULATION AHEAD: suppose they practice during the morning and later in the afternoon--perhaps an early afternoon nap helps solidify what they practiced, after which they'd hold their second practice session, which in turn would be solidified by their regular night's sleep. Perhaps that's partially responsible for their ability to excel.)
I suppose "sleeping" isn't exactly the kind of hiatus-with-reflection you were talking about; but I assume it's included in such breaks, if your break away from music lasts for longer than a day. Even if we ignore the sleeping component, I think there's also some value to the common sense wisdom that your brain needs time to process things unconsciously, like Versilaryan said.
Habanc wrote:There wouldn't be the mantra of "Practice makes perfect", if it weren't widely applicable, and that's what has me on edge.
Well, yes and no. Even though many adages, maxims, and proverbs have a grain of truth in them, sometimes it's not much more than a grain. Here, let me quote the first Ericsson et al paper above:
To people who have never reached a national or international level of competition, it may appear that excellence is simply the result of practicing daily for years or even decades. However, living in a cave does not make you a geologist. Not all practice makes perfect. You need a particular kind of practice—deliberate practice—to develop expertise. When most people practice, they focus on the things they already know how to do. Deliberate practice is different. It entails considerable, specific, and sustained efforts to do something you can’t do well—or even at all. Research across domains shows that it is only by working at what you can’t do that you turn into the expert you want to become.
And here's another nice snippet:
The famous violinist Nathan Milstein wrote: “Practice as much as you feel you can accomplish with concentration. Once when I became concerned because others around me practiced all day long, I asked [my mentor] Professor Auer how many hours I should practice, and he said, ‘It really doesn’t matter how long. If you practice with your fingers, no amount is enough. If you practice with your head, two hours is plenty.’”
tl;dr: Science suggests you may be on to something.