For me it's not so much a matter of time as it is about ergonomics. Typing with only one hand or constantly switching between the mouse and the keyboard is not

For me it's not so much a matter of time as it is about ergonomics. Typing with only one hand or constantly switching between the mouse and the keyboard is not good for your arms. Starcraft players on the other hand perform a task where one hand can always stay on the mouse while the other is on the keyboard.