It depends very much on the type of work you are doing. If you are building a brick wall, then spreading out the hours isn't going to make much difference - it takes 100 hours to build that wall or whatever. Music practice is very different though as simple hours are probably not enough - you'd need to really engage with and commit the music to muscle memory (I'm no musician, just guessing).
Something like making a CRUD web app is probably closer to building a wall than perfectly playing a concerto. If you're trying to build in a brand new feature into your web app that requires genuine creativity and a difficult algorithm, then you'll probably find that creating that feature in a single intense session while still fresh is going to work far better than trying to patch it together across a day of interruptions.
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It depends very much on the type of work you are doing. If you are building a brick wall, then spreading out the hours isn't going to make much difference - it takes 100 hours to build that wall or whatever. Music practice is very different though as simple hours are probably not enough - you'd need to really engage with and commit the music to muscle memory (I'm no musician, just guessing).
Something like making a CRUD web app is probably closer to building a wall than perfectly playing a concerto. If you're trying to build in a brand new feature into your web app that requires genuine creativity and a difficult algorithm, then you'll probably find that creating that feature in a single intense session while still fresh is going to work far better than trying to patch it together across a day of interruptions.