There are 365 days per year available for work. There are 52 weeeks per year in which you already have 2 days off per week, leaving 261 days available for work.

Since you spend 16 hours each day away from work, you have used up 170 days, leaving only 91 days available.

You spend 30 minutes each day on coffee breaks that accounts for 23 days each year, leaving only 68 days available.

With a 1 hour lunch period each day, you have used up another 46 days, leaving only 22 days available for work.

You normally spend 2 days per year on sick leave. This leaves you only 20 days available for work.

We are off for 5 holidays per year, so your available working time is down to 15 days.