Choosing outfits for work, nights out, dinner parties, holidays, gym and other activities means the average female will spend 287 days rifling through their wardrobe.
The biggest chunk of that time is used up picking a killer ensemble for Friday or Saturday nights out or selecting the right clothes for a holiday.
Experts found on average women spend 16 minutes every weekday morning deciding what to wear and around 14 minutes on a Saturday or Sunday morning.
A spokesman for clothes giant Matalan, which compiled the results after polling 2,491 women, said: “What you wear has a direct impact on how you feel about yourself and it is important a woman feels exceptional in her outfit.
“Whatever the occasion your clothes portray an image and we understand this is fundamentally important to women.”
The study – which was based on an adult lifetime from the age of 16 to 60 – found most women will spend around 20 minutes deciding what to wear before hitting the town on a weekend night.
Week nights out can take up to 20 minutes a time too.
Deciding on what clothes to take on holiday uses up to 52 minutes each time.
While on holiday, ten minutes a morning will be taken up trying to find an acceptable outfit with another ten minutes spent picking evening clothes.
On top of that dinner parties, Christmas parties and black tie events – at around 36 minutes a time six times a year – adds up to three and a half days.
The study also found on average women will try on two outfits each morning before coming to a final decision. And one in two women spend 15 minutes the night before work working out what to wear.