A back-of-the-envelope calculator
I have never measured any of this. The minutes below are my guesses at what one interruption costs, and a guess multiplied by 52 is still a guess — so every one of them is editable. Change the numbers you disagree with and the total follows.
The arithmetic, in full: occurrences × minutes each × 5 workdays where the count is daily, × 52 weeks. No holidays, no diminishing returns, no learning curve.
My reasoning: Reopening the app and finding your place again. Counted weekly.
My reasoning: Switching back to the source window and copying it again. Counted across 5 workdays a week.
My reasoning: A terminal, a cd, a fetch, and reading the status. Counted across 5 workdays a week.
My reasoning: Opening the editor, the terminal, and the dev server by hand. Counted across 5 workdays a week.
My reasoning: Hunting for the mute button in whichever app is in front. Counted weekly.
On the numbers you entered, that's
131
hours a year
Roughly 16 working days, if every assumption above holds — which is a large if.