When you change focus every few hours, your ability to focus decreases. Working on high-intensity tasks for long hours or weeks helps you build a great level of skill in that area.
Use batching in the short-term.
Schedule the high-intensity tasks into a single, long stretch of time so that you can quickly master it.
Use batching in the long-term.
Take stock of your work activities in the coming months. Then work on a single activity (e.g., learning) for a whole week or more, leaving other tasks for later.