Over a year this adds up to an incredible 627 hours and 28 minutes - almost an entire month.
Researchers also found that the average woman spends 50 minutes a week picking outfits.
They spend even longer - one hour and 32 minutes - worrying if what they have chosen still looks good, the 'Daily Express' reported.
The study of 2,000 women, by Invista, a company that produces polymers and fibres, found weight worries are a common concern for many women.
Nine out of 10 girls always select an outfit which hides the parts of their body they most dislike, the study found.