I have kept a record of my two beardies growth since we got them.
At first they were only growing 6mm per week. Some feeding and light changes and this has increased significantly.
At the moment they have averaged 120mm growth per week.
This week I replaced their 100w basking globe with a 150w. They have since been more active, and are eating more than before, so I expect that they will increase their growth rate.
They probably shed every two weeks. Bolt looks like a frill neck at the moment becaues his skin from around his neck is sticking out around his head. Will give him a bath to help process, (they like warm baths).