My current un-pumped length and girth are a bit greater than my length and girth were inside the cylinder during my first pumping sessions. I started with a 1.5” cylinder which has an inside diameter of 4.72”. It took about six months before I could pack the cylinder at mid shaft. Today my un-pumped mid shaft girth is about 5”.
I placed a piece of adhesive tape to mark the maximum pumped length I could achieve in my first cylinder. I recently used that cylinder and when fully pumped, the tip of my dick reached almost 3/4” beyond the edge of the tape.
Based on the above, I would say achieving the penis you see in the cylinder is a definitely a possibility. However, bear in mind it has taken me about 2.5 years to get to where I am today.
I recommend you also mark your cylinder at the maximum pumped length so you can measure your growth.
Start 11/09 BPEL: 5.5", EG: 4.4"
Current. BPEL: 6:4", EG: 5.5"