The biggest distraction and time-consuming topic are from my point of view missing in your post, it is the direct environment. Modern offices are open (open-plan vs. single office), allowing ad hoc communication if required. As a line manager, you should say things like: "My door is always open for you!". And even if you're not working in an open office, it becomes virtually open nowadays (think of all that messengers).
This is not bad in principle and definitely good for internal communication but makes it hard to keep the focus on specific tasks. The main problem is, even if you perfectly manage your time and you are able to focus exclusively on a single task, you get an additional aspect in the game that is nearly impossible to manage (especially if you are the key knowledge). But even if you don't know if you will be asked by colleagues one, two, ten or twenty times a day, add this to your planning as well, simply cause, you will be distracted and it will cost your time.
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The biggest distraction and time-consuming topic are from my point of view missing in your post, it is the direct environment. Modern offices are open (open-plan vs. single office), allowing ad hoc communication if required. As a line manager, you should say things like: "My door is always open for you!". And even if you're not working in an open office, it becomes virtually open nowadays (think of all that messengers).
This is not bad in principle and definitely good for internal communication but makes it hard to keep the focus on specific tasks. The main problem is, even if you perfectly manage your time and you are able to focus exclusively on a single task, you get an additional aspect in the game that is nearly impossible to manage (especially if you are the key knowledge). But even if you don't know if you will be asked by colleagues one, two, ten or twenty times a day, add this to your planning as well, simply cause, you will be distracted and it will cost your time.