Hi
Yes when they shed they do get a pale and cloudy look and many can become a touch grumpy during a shed As for a timeframe they are all different.Younger beardies tend to shed frequently and quickly but as they get older the sheds are farther in between and take longer to complete.If you want to help the process out then you can increase the frequency of baths but whatever you do dont pull the shed off as it could injure the scales.Good Luck