1 - 2 часы
The sound stop working on my iPhone 5. I couldn't hear calls, alerts, alarms, etc. It was very aggravating because I didn't want to buy a new phone! The rest of the phone worked fine but the speaker was just not working.
The repair was a little difficult and took about 45 minutes, but it fixed it perfectly!
It's a lot cheaper to replace a $20 part than buy a new phone!