Since today, I am supposed to ventilate by shock ventilation 3 times a day to help the screed dry.
It took me 6 minutes to go through the whole house once and open every window.
6 minutes opening, 6 minutes closing, 2 times a day, equals 24 minutes per day.
168 minutes per week, 730 minutes per month.
12h10m per month to ventilate.
How much I am looking forward to our ventilation system.
Costs are 13,500€. With a service life of 20 years for the system:
Time saving/year: 730min/month x 12 months: 146h
Time saving/20 years: 2920h
Cost/hour time saving: 13,500€/2920h = 4.62€/h
One can take such a calculation as they please – without ventilation, I probably wouldn't have to open EVERY window – still, it makes one (at least me) aware of how much time is spent on things that could also be done for you.
I've made worse deals than €4.62 for an hour of free time.
I was not even aware that so much time goes into ventilating.