How long does it take to completely charge Samsung Galaxy Pocket?

It is not indicated on a "quick start guide" of GT-S5300 on how long does it takes to completely charge the Samsung Galaxy Pocket. I also visited the samsung.com for the full manual of this unit but it is not yet appears on the list.

The "Travel Adapter" ( the charger ) doesn't have an indicator too.

You can check your phone screen to know if it is still in charging state.
If it is, you will see a lightning sign inside a battery image.

You will here a tone once the charging is completed.

As I've observed, it takes to 3 HOURS for the Samsung Galaxy Pocket to be completely charge (if totally drained when charged).