I probably donated 10 years of idle CPU time between 2005 to 2015.
10 years of idle time in 10 years. Did you just like leave a computer switched on for 10 years while you took up farming?
I mean I had the programme running for 10 years, donating whenever it was on and idle or on a low load. It was not necessary to be perfectly idle, the programme could take just e.g. 50% of the CPU. (Famously on a core2duo running programmes that were not multi-core). All in all my computer was probably on 12 hours per day