Answer: 12
If she makes 9 bracelets every 1 hour, she'll make 108 bracelets in 12 hours.
Math:
108 divided by 9 equals 12
The amount of hours it takes to make a certain number of bracelets is 1/9 the number of bracelets.
Examples:
To make 216 bracelets it'll take 24 hours because 216 divided by 9 is 24.
To make 630 bracelets it'll take 70 hours because 630 divided by 9 is 70.