How long should underwear last?

Related questions

1. What happens if you wear the same underwear for a week?
2. What is the most breathable underwear?
3. Is a bra considered underwear?
4. What happens when you don't wear underwear?
5. How many pairs of underwear should you own?
6. What is the white stuff in my underwear everyday?
7. Is it bad to sleep with underwear on?
8. Is it OK to wear new underwear without washing?
9. Should a woman sleep with underwear?
10. Is it bad to sleep with clothes on?

Tags

1. #replace
2. #months
3. #underwear
4. #lifespan
5. #factors
6. #course
7. #research
8. #should
9. #panties
10. #depending
11. #often
12. #several
13. #about
14. #reason