Length: 6 characters
- Lowercase: 10 minutes
- Uppercase: 10 hours
- Numbers & Symbols: 18 days
Length: 7 characters
- Lowercase: 4 hours
- Uppercase: 23 days
- Numbers & Symbols: 4 years
Length: 8 characters
- Lowercase: 4 days
- Uppercase: 3 years
- Numbers & Symbols: 463 years
Length: 9 characters
- Lowercase: 4 months
- Uppercase: 178 years
- Numbers & Symbols: 44,530 years
Source: Business Week