Pat comments on Collating widely available time/money trades - Less Wrong
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You could install a bidet on your toilet. Disclosure: I've never used a bidet.
Cost
Total: $1,000
Time savings (assuming 1.5 bowel movements/day)
Total: 6 hours/year (PV ~ 37 hours, assuming a 10% discount rate and a bidet lifetime of 10 years)
Cost per hour: $27
It really takes you half a minute per bathroom visit to wipe your bottom, and saves you any time in the shower?
(It occurs to me that questioning your time estimates as high sends bad signals about my personal characteristics...)