Granted, the world spins slower to lengthen the day out. Because of this, the calendar is thrown off and the entire system is disrupted. Ecosystems die off as internal clocks of various animals mess up and they get killed by other animals en masse. Businesses collapse as their shipping plans mess up, planes go miles off course as the planet spins slower. Around the world, people feel sudden lurches as the earth slows down beneath their feet. People fall off bridges, trip and break their necks, and construction workers get impaled on rebar. Your bane is that everybody gets mad at you and they force you to pay for your accidental murders and crimes.
I wish for the ability to convince people of anything I choose.