The biggest Backdrop I've ever Made

It was an event last month... big enough...
And I have an extraordinary task to finish the backdrop for the opening ceremony.
Here is the details:
Dimension: 3 m x 22 m.
File : Adobe Photoshop Large Image.
Resolution: 55 dpi (very low res.. indeed)
File Size: 1.xx GB Flatten to 6xx MB
Tools: Macpro, 2.66 GHz... 1 GB RAM, 250 GB HDD.
Time: 2 days (job hours).
Result: Not bad.. :)
photo taken by: Avan (RiauPos EventManagement)